# Angel

Newest questions and responses by Angel-
## Philosophy

In history of science, Why is the medieval period referred to as "Dark Ages".

*asked on December 15, 2018* -
## mythology

Can someone tell me if god is real or if it is just a myth? I have a question on my homework and it says something about god but I don't know like anything about it.

*asked on December 12, 2018* -
## pre-algebra

(01.03 LC) What is the value of 4 to the power of 6 over 4 to the power of 8? (1 point)

*asked on November 26, 2018* -
## Chemistry

An ammonium salt of an alkanoic acid gain 60.5% of carbon 6.5% of hydrogen gas. If 0.309g of the salt yields 0.0313g of nitrogen. Determine the empirical formula of the salt

*asked on November 13, 2018* -
## Chemistry

Calculate the volume of CO2 produced at S.t.p when 25cm3 of 0.25mol/dm3 Hcl reacts with Na2Co3.

*asked on November 11, 2018* -
## math

6x−10y=730 7x-9=y Solve the system by substitution.

*asked on October 21, 2018* -
## Physics

1. Two people are pushing a disabled car. One exerts a force of 200 N East, the other a force of 250 N East. What is the net force exerted on the car? 2. Two hockey players strike a puck simultaneously from opposite sides. Red #3 hits it with 40 N of force

*asked on October 11, 2018* -
## physics

A train moves along a straight track towards a road crossing with a speed of 85.0 km/hr. At the moment the front car of the train arrives at the crossing the conductor applies the brakes which decelerates the train at a constant rate. If the train is 6.00

*asked on September 26, 2018* -
## Physics

How fast would a bird move in the air if it were flying with a speed of 50 m/h directly into a strong wind of 50 m/h? a) 50 m/h b) 100 m/h c) 0 m/h What is the resultant of a 6 N east force pushing on an object and a 8 N force acting on an object at the

*asked on September 26, 2018* -
## Physics

How fast would a bird move in the air if it were flying with a speed of 50 m/h directly into a strong wind of 50 m/h? a) 50 m/h b) 100 m/h c) 0 m/h* What is the resultant of a 6 N east force pushing on an object and a 8 N force acting on an object at the

*asked on September 26, 2018* -
## Physics

What is the acceleration of a mechanical part that moves from 0 to 10 m/s in 1 s? a.10 m/s b.20 m/s c.10 m/s2^

*asked on September 19, 2018* -
## History

I don't know where to start and how I should word this. Please Help! In the Declaration of Independence, who (specifically, name the person) do the Colonists blame for the problems the Colonies are having with Britain? How do you know? Why did they phrase

*asked on August 31, 2018* -
## Math

THE INPUT IS 25 AND THE OUTPUT IS 15 THE NEXT ONE IS INPUT 30 OUTPUT 18 WHAT IS THE OPERATIONS PLEASE HELP!

*asked on August 9, 2018* -
## science

differences between rotation and revolution of the earth

*asked on June 19, 2018* -
## civic

advantages of confedral constitution

*asked on June 19, 2018* -
## Chemistry

If you have 10.00 mL of 0.5875 M H3PO4, how many mL of 0.2625 M NaOH are needed to reach the point of complete neutralization?

*asked on May 17, 2018* -
## chemistry

The basicity of tetraoxosulphat(iv)acid is 2 explain this statement with an equation showing the reaction between the acid and potassium hydroxide

*asked on May 6, 2018* -
## math

How many ways can I select 5 pieces of fruit from apples, oranges, strawberries and pears (I have at least 5 of each)?

*asked on April 20, 2018* -
## Math

There are 20 red, 20 green and 20 blue balls in an urn. In how many different ways can 10 balls be selected? How many ways are there if there are 6 red balls instead of 20?

*asked on March 27, 2018* -
## Chemistry

Suppose that a device is using a 5.00-mg sample of silicon that is doped with 1 × 10-5% (by mass) phosphorus. How many phosphorus atoms are in the sample?

*asked on March 6, 2018* -
## Health

1. Identify a common defense mechanism that protects you from an uncomfortable feeling. A. reaction formation *** My Answer B. abstinence C. mature behaviors D. acceptance 2. Anger is a normal emotion that all humans feel at some time. It is important to

*asked on February 9, 2018* -
## Probability

Based on experience, the manager of a credit card company reports that three out of every ten credit card applications are disapproved. Use the normal approximation to determine the probability that at most 50 of 200 new credit applications will be

*asked on January 23, 2018* -
## Probability

Suppose that the lifetime of a farm tractor follows a normal distribution with a mean of eight years and a standard deviation of 1.7 years. If the manufacturer is willing to replace only 5% of the tractors that fail within the warranty period, how long

*asked on January 23, 2018* -
## Probability

Gani, a regular coffee drinker, goes to his favorite coffee shop every night for a cup of hot cappuccino. The amount of time that he stays in his favorite spot is normally distributed with a mean of 45 minutes and a standard deviation of 5 minutes. Above

*asked on January 23, 2018* -
## Probability

Suppose that a drug is known to be 90% effective in treating a certain disease. What is the probability that it will be successful in treating seven to ten out of 12 patients with the disease?

*asked on January 23, 2018* -
## Physics

A charge +q is at the origin. A charge -2q is at x = 6.30 m on the +x axis. (a) For what finite value of x is the electric field zero? (b)or what finite values of x is the electric potential zero? (Note: Assume a reference level of potential V = 0 at r =

*asked on January 21, 2018* -
## Math

Why did they remove my question about youtube? That's what i'm learning in school

*asked on January 10, 2018* -
## Probability

In a university, 30% of the students major in Business management, 25% major in mathematics and 10% major in both business management and mathematics. A student from this university is selected at random. A) what is the probability that the student majors

*asked on January 7, 2018* -
## Physics

A +33.0 nC charge is placed at the origin of an xy-coordinate system, and a −25.0 nC charge is placed at the point (1.500 m, −0.0540 m). (a) Determine the magnitude and the direction of the force that the positive charge exerts on the negative charge.

*asked on January 6, 2018* -
## math

numbers of ways a person can travel from a to c via b, if there are 3 routes from a to b and 5 routes from b to c

*asked on January 6, 2018* -
## Statistics

A committe of 5 members will be chosen from a group of 10 teachers and 5 students. What is the probability that the committee will have A) all teachers? B) 3 teachers and 2 students? C) 3 or 4 teachers?

*asked on January 6, 2018* -
## Statistics

A committe of 5 members will be chosen from a group of 10 teachers and 5 students. What is the probability that the committee will have A) all teachers? B) 3 teachers and 2 students? C) 3 or 4 teachers?

*asked on January 5, 2018* -
## math

The square root of the product of 4 and a number is 26

*asked on January 2, 2018* -
## Calculus

water drips into an upside down cone, whose diameter at the base is 10 cm , and whose height is 15 cm. If the water is dripping int a rate of 2cm^3 per minute, how fast is the height rising.

*asked on December 14, 2017* -
## Math please help !!!!!!

How many blocks 1 inch on each edge would it take to fill a shoe box that is 12 inches long , 6inches wide , and 5 inches high ?

*asked on December 13, 2017* -
## linear algebra

Find the scalar equation for the plane passing through the point P=(0, 2, −1) and containing the line L defined by x = 2+t y = 4+t z = −6+7t

*asked on December 3, 2017* -
## linear algebra

Let L1 be the line passing through the point P1=(9, 0, 0) with direction vector →d1=[3, 2, −2]T, and let L2 be the line passing through the point P2=(−10, 8, 4) with direction vector →d2=[3, 0, 2]T. Find the shortest distance d between these two

*asked on December 1, 2017* -
## Algebra

1.What is the slope of the line that passes through the pair of points (3,8) and (9,5)? Options -2 2 1/2 -1/2 2.Write an equation in point-slope form for the line Through the given point with the given slope. (8,3);m=5 Options Y+3=5(x-8) Y+3=5x-8

*asked on November 29, 2017* -
## Linear Algebra

Let L be the line with parametric equations x = 2+3t y = 3−2t z = 2+t Find the shortest distance d from the point P0=(−5, 1, −4) to L, and the point Q on L that is closest to P0. Use the square root symbol '√' where needed to give an exact value

*asked on November 26, 2017* -
## Physics

A gas is kept at a pressure of 4.00 × 105 Pa and a temperature of 30.0 °C. When the pressure is reduced to 3.00 × 105 Pa and the temperature raised to 40.0 °C, the volume is measured to be 0.45 × 10^−4 m^3. Estimate the original volume of the gas. I

*asked on November 18, 2017* -
## Physics

The density of copper is 8.96 g cm^−3 and its molar mass is 64 g mol^−1. The mass of an atom of copper is 1.1*10^-22 g Determine the number of copper atoms per cubic metre.

*asked on November 18, 2017* -
## Math

Pradip and pam each have apple slices and orange slices. The ratio of apple slices to the total number of slices is 4 to 11. The ratio of the total number of slices to orange slices on Pam's plate is 13:6. Neither person has more than 20 total slices. Who

*asked on October 17, 2017* -
## Linear Algebra

Given the following matrices A and B, find an invertible matrix U such that UA = B: A and B are 4x4 matrix and i have to find U. I was wondering how i would do this ie. the steps. if you could be as detailed as possible that would help me. I wanted to try

*asked on October 11, 2017* -
## Physics

A train slows down as it rounds a sharp horizontal turn, going from 86.0 km/h to 44.0 km/h in the 13.0 s that it takes to round the bend. The radius of the curve is 140 m. Compute the acceleration at the moment the train speed reaches 44.0 km/h. Assume the

*asked on October 10, 2017* -
## Linear Algebra

Given the following vector X, find a non-zero square matrix A such that AX=0: X=[2 -5 3]^T Im not sure how i would find the sqare matrix a?

*asked on October 2, 2017* -
## Calculus

Use the given graph of f to find a number δ such that if 0 < |x − 3| < δ then |f(x) − 2| < 0.5. since i cannot put up the graph ill put the coordinates (2.6,1.5) (3,2) (3.8,2.5) Please help im not sure how to solve this

*asked on September 25, 2017* -
## Physics/Math

Prove cos^2 α + cos?^2 β + cos^2 γ = 1 . Thank You

*asked on September 24, 2017* -
## Physics

I m doing an assignment and this is what is asks: (c) Find the sum of the squares of the cosines of the corresponding coordinate direction angles found above. (Measure the cosines of the corresponding coordinate direction angles from the x-y plane.) Im not

*asked on September 22, 2017* -
## History

How did John Calhoun react to the Tariff of 1828? A. He used his power as Vice President to influence President Jackson to oppose the tariff. B. He led a charge to impose sticker regulations on the second bank of the United States. C. He devised a force

*asked on August 29, 2017* -
## science

A coach tells his little league players that hitting a 0.275 batting average, within 7% percentage error, means that they had a really great season. Seven year old Tommy ended the season hitting a 0.258 batting average. According to his coach, did he have

*asked on August 22, 2017* -
## Math

A rectangular garden plot 16 by 24 meters is to be bordered by a strip of uniform width x meter so as to double the area. Find x.

*asked on August 1, 2017* -
## HVAC

Two HVAC/R technicians are discussing the tape used in HVAC/R repairs. Technician A says that cloth duct tape is preferred for use in attics. Technician B says that UL 181 tape is normally required for duct closing systems. Which one of the following

*asked on June 13, 2017* -
## Math

Simpilfy the radical expression by rationalzing the denoiminator? 3/sqrt15 a)sqrt45/15 b)sqrt15/5 c)5sqrt15*** d)sqrt3

*asked on June 10, 2017* -
## Math

What are the solutions of the system? y=x^2+3x-4 y=2x+2 a) (-3,6) and (2,-4)** b) (-3,-4) and (2,6) c) (-3,-4) and (-2,-2) d) no solutions

*asked on June 10, 2017* -
## Science (soon if so)

Over the years technology has gotten a) smaller**** b) heavier c) less complicated d) more expensive What is nanotechnology? a) Nanotechnology is engineering new elements by changing their atoms***** b)Nanotechnology is a way to lengthen radio waves and

*asked on June 8, 2017* -
## Pre- Algebra

If you were to roll a fair number cube 120 times, how many times would you expect to roll a 4 based on theoretical probability

*asked on May 19, 2017* -
## geography

Explain the effects of the poor service delivery. There must evidence that i actually investigate the poor service delivery physically where possible. Explanation must be with regard to social or Economic or Environmental problem

*asked on April 29, 2017* -
## Microbes and society

In Chapter 9 of the Bible, in the book of Exodus, the sixth plague of Egypt is described in this way: “Then the Lord said to Moses and Aaron, ‘Take double handful soot from a furnace, and in the presence of Pharaoh, let Moses scatter it toward the sky.

*asked on April 21, 2017* -
## Algebra

Check my answer- Solve the system of equations algebraically. Show all of your steps. Y=x^2+2x Y=3x+20 My answer: X^2+2x+3x+20 X^2-x-20 (x-5),(x+4)=0 x=5, x=-4 y=35, y=8 Thank you!

*asked on April 4, 2017* -
## Maths

the angles of of evolution of the top of a hill from the City centres of two towns on either side of the hill are observed to be 30Â° and 60Â° respectively. if the distance of hill of the top from the city centre of first is 9 kilometre find in

*asked on March 22, 2017* -
## Physics

A 5g bullet is fired horizontally and hits an 8kg block of wood (initially at rest) which can move freely. The wood and the bullet move with a velocity of 0.50 m/s after impact. What is the initial velocity of the bullet?

*asked on March 14, 2017* -
## Physics

A 5 gram bullet is fired horizontally and hits an 8 kilogram block of wood (initially at rest) which can move freely. The wood and the bullet move with a velocity of 0.50 m/s after impact. What is the initial velocity of the bullet?

*asked on March 14, 2017* -
## Math

The pitch of a screw is the distance between its threads. With each complete rotation, the screw goes in or out a distance equal to its pitch. If the pitch of a screw is 1/17 inch, how far will it go into a piece of oak when it is turned 14 complete

*asked on March 13, 2017* -
## Math

If a recipe calls for 4 eggs for 8 people how many eggs would it be for 32 people

*asked on February 23, 2017* -
## Calculus-derivatives

At what points on the graph of f(x)=6x^2+4x-9 is the slope of the tangent line -2?

*asked on February 8, 2017* -
## Chemistry

1.38 mol HCl and 2.9 mol NaOH react accord- ing to the equation HCl + NaOH −→ NaCl + H2O . If the limiting reactant is HCl, determine the amount of excess reactant that remains. Answer in units of mol.

*asked on February 7, 2017* -
## Chemistry

1.38 mol HCl and 2.9 mol NaOH react accord- ing to the equation HCl + NaOH −→ NaCl + H2O . If the limiting reactant is HCl, determine the amount of excess reactant that remains. Answer in units of mol.

*asked on February 7, 2017* -
## Math

My numerator is 2 less than my denominator I am more than 1/2 what fraction can i be?

*asked on February 5, 2017* -
## calculus

define f(x)={x+a if x>2 {-1 if x=2 {ax+b if x

*asked on January 29, 2017* -
## math geometry

Find the area of the triangle defined by the coordinates (-3, -4), (-7, 0), and (-3, 4).

*asked on January 24, 2017* -
## science

Numerical problem : The dimensions of a certain water tank are 8m x 6m x 4m. What is the pressure at the bottom of the tank, if the tank is half filled?

*asked on January 15, 2017* -
## Math

If the coefficient of sliding friction for steel on ice is 0.05, what force is required to keep a man weighing 150 lbs moving at constant speed along ice?

*asked on January 15, 2017* -
## Dynamics

A level fight bomber flying at 300 ft/s releases a bomb at an elevation of 6400 ft. Approximately how long before the bomb strikes the earth?

*asked on January 15, 2017* -
## Dynamics of rigid bodies

a stone is thrown upward with a velocity of 40m/s.Determine the time of the stone when it is at a height of 10m and is moving downwards.

*asked on January 6, 2017* -
## Chemistry AP

How many mL of0.4M AgNO3 solution must be added to 200mL of0.4 M NaI in order to for 11.7 grams of AgI precipitate?

*asked on December 28, 2016* -
## Science

A lead calorimeter with mass of 150g contains 200g of water. The calorimeter and water are in thermal equilibrium at a specific temperature. Two metallic blocks are placed into the water. One is a 50.0g piece of aluminum heated at 90 degrees celcius. The

*asked on December 2, 2016* -
## math

Put the following decimals and fractions in order from greastest to least: 0.15, 2/3, 3/5, 0.25, 1 1/8

*asked on November 29, 2016* -
## Analytical chemistry

Calculate the expected concentrations of vitamin B6 and caffeine in the stock solution assuming exactly 0.0506 g of pyridoxine hydrochloride (vitamin B6) and 0.1253 g of caffeine are dissolved in a 100 mL volumetric flask.

*asked on November 24, 2016* -
## Mathematics

The area of one of the faces of the cube below is x^2+2x+1 cm^2. Find an expression in mixed radical form for the length of the interior design. plzzzzzzzzzzzzz helppppppppp on thisssss. On my previous question I even showed my work

*asked on November 17, 2016* -
## Math

The area of one of the faces of the cube below is x^2+2x+1 cm^2. Find an expression in mixed radical form for the length of the interior design. Since no one looked at my previous work.................

*asked on November 17, 2016* -
## Math

The area of one of the faces of the cube below is x^2+2x+1 cm^2. Find an expression in mixed radical form for the length of the interior design. My Work: Step 1: a^2 + b^2 = c^2 =(x-1)(x-1) x-1 equals to all the sides of the cube Step 2: a^2 + b^2 = c^2

*asked on November 17, 2016* -
## Business Law

Can anyone please help? Covenants not to compete (noncompete agreements) are generally legal in most states as a matter of employment contract law as long as: Choose All that APPLY: a. they are not excessive in the amount of time they run b. the hired

*asked on November 13, 2016* -
## Geometry

In Parallelogram PARK, angle P = (7x) degree angle A = (3x - 20) degree angle K = (5y - 10) degree. What is x + y?

*asked on November 12, 2016* -
## math

Show me how to make $0.60 in two ways,without using quarters or pennies

*asked on October 20, 2016* -
## Analytical chemistry

Calculate to four decimal places the mass of pure dry CaCO3 required to make 1 L of a 1000 ppm Ca stock solution.

*asked on October 20, 2016* -
## MATH

A dietician is planning a snack package of fruit and nuts. Each ounce of fruit will supply zero units of protein, 3 units of carbohydrates, and 2 unitss of fat, and will contain 20 calories. Each ounce of nuts will supply 2 units of protein, 11

*asked on October 19, 2016* -
## 6th grade math

If someone can please help me i keep re reading my mathbook I need help i tried I'm unsure: Is there a relationship between area and perimeter? (My answer : yes they both are meadurements one reads the outside and one inside.) Does changing one mean the

*asked on October 18, 2016* -
## algebra

write an explicit formula for the nth term an for 17,20,23,26

*asked on October 17, 2016* -
## Math

Find the quotientshapes to the nearest hundreth. 5.8 divided by 30.8 Is this correct so I round 5.8 to 6 and 30.8 to 31 ?

*asked on October 11, 2016* -
## 6 grade math

Find the area of the figure at right in at least two different ways. Explain how you get your answer with diagrams and remember to label them with the correct units. So the image is a 10cm by 15cm and smaller box attach to the side. Like an London shape .

*asked on October 11, 2016* -
## Algebra

Find all points on the line x = 3 that are 8 units from the point (10,-10).

*asked on October 11, 2016* -
## Statistics

Can anyone help me with this? Which of the following statements is true about a 99% confidence interval? a. The interval contains 99% of the population. b. The probability that the population mean is in the interval is 99%. c. The interval is wider than a

*asked on October 8, 2016* -
## English

When summarizing the of a plot, one should notice the key ideas about how the conflict builds.

*asked on October 6, 2016* -
## English

Which are features of myths? Check all that apply. supernatural gods or animals fantastic settings humorous elements that entertain the reader an attempt to explain the origin of the universe characters found in everyday life conflicts between worlds,

*asked on October 6, 2016* -
## Math graphs,dot,ven

I did a bar graph I think it is easier than dot and ven diagram. Am I correct because ven diagram there are no similarities and dot is to long.the problem asks as follows. Display the data using a dot plot,bar graph or vennot diagram.decide which data

*asked on October 2, 2016* -
## Trigonometry

find an equation of the line passing throug (2,6) and is inclined at an angle 60 degrees counterclockwise from the horizontal

*asked on October 1, 2016* -
## analytical chemistry

Calculate the concentration of the initial nitrate stock solution (in ppm) if exactly 0.361 g of KNO3 is dissolved in a 1 L volumetric flask with distilled water. Here I want the concentration of nitrogen in ppm.

*asked on September 22, 2016* -
## analytical chemistry

Calculate the concentration of the initial nitrate stock solution (in ppm) if exactly 0.361 g of KNO3 is dissolved in a 1 L volumetric flask with distilled water.

*asked on September 21, 2016* -
## math

How many centimeters would represent 40 kilometers if you were using a scale of 1 cm = 1 m? 1 cm = 1 m 40 km = X x = 1 x 40 x = 40 cm

*asked on September 14, 2016* -
## math

What distance on the ground does 5 inches on a map represent if the scale is 1 in. = 1.5 mi.? 1 inch = 1.5 miles 5 inches =X x- 1.5 x5 x= 7.5 miles

*asked on September 14, 2016*