# Maria

Newest questions posted by Maria-
## Math

point B is between point A and C, if AC=7b +13, AB=25, and BC= 3b, b= -
## Geometry

Find the value of x (11x-15) (5x-13) -
## Cell biology

you ask your lab assistant to prepare IL of solution Zeta at a concentration of 1M. He comes up to you with a 0.5M stock solution ans asks for help in calculating how much to use. what do you tell him? I dont think my answer is correct. I got 2000 mL of -
## Life orientation

Difine the concept 'risk bahviour' and explain why is it important for teenagers to investigate and be knowledgeable about it -
## Algebraic Expressions

Terrance picked 54 apples. He kept a apples for himself and gave each of 6 friends an equal number of apples. How many apples did each friend receive? -
## Micro economics

S(p)= -200+50p D(p)=1000-25p Find the equilibrium price for t shirts at this concert. What is the equilibrium quantity? -
## Philosphy

Epircurus believed that the main aim of human existence is pleasure. Do you agree with his theory? -
## Philosphy

What system used in schools is the modern version of virtue ethics? -
## Math

Paul and Sammy take part in a race. The probability tha Paul wins the race is 9/35. The probability that Sammy wins the race is 26%. Who is more likely to win the race? Give a reason for your answer. -
## Math

A business finds that it has to increase its staff by 5% each year due to growth. After how many years would the size of their staff double? -
## Physics 2

in the figure a rario transmitting station operating at a frequency of 100 MHz has two identical coherent antennas. Antenna A is 124 m from point P and anternna B is 421 m from point P. what type of interference, destructive, constructive, or neither -
## Physics

a siren on top of the police car emits sound at frequency of 820 Hz. The car passed a bystander on a sidewalk and is receding at speed 142 km/h/ what is the frequency the bystander hears. assume the speed of sound in air to be 340 m/s. 142 km/h x 1000 / -
## PHYSICS 2 - LENSES

A 75 cm tall object is positioned 80 cm from a bi-concave lens with a focal length of 90 cm. **now i tried doing the problems, i just need feed back on if its correct or not. **** 1. calculate the distance where the image is formed Used lens equation: -
## physics 2

A siren on the top of the police car moving with a speed of 40 m/s emits sound at frequency of 820Hz. Ahead of the car, there is a truck moving in the same direction as the car but with a speed of 30 m/s. Assume the speed of sound in air to be 340m/s. a) -
## Math

Find property tax of house valued $450,000 of the tac base is $1.2 For every $90 in value. I get 4,999.986 -
## Physics

A wire loop of radius 0.10m lies so that an external magnetic field of magnetic 0.50T is perpendicular to the loop. the field changes its magnitude to 0.01 T in 2.5 s. find the magnitude and the direction of the average induced emf in the loop during this -
## physics

A metal rod is moving in uniform magnetic field of 2T with a velocity perpendicular to the direction of the field as shown on the diagram. If the speed of the rod is 5m/s and the distance between points A and B is 0.1 meters what is the potential -
## physics

A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. this best demonstrates that: a) the carton of milk has no acceleration b) there is an action-reaction pair of forces c) gravity tends to -
## Math

From 2003 to 2004 the number of applicants to a college increased 15% to 5060.How many applicants were there in 2003? -
## Math

Marissa and her friend walked to the park on Saturday. the park was 600 meters away from marissa's house. how far did the girls walk in kilometers? -
## Physics

Two point charges lie along the y-axis. A charge of q1 = -7 μC is at y = 6.0 m, and a charge of q2 = -6.5 μC is at y = -4.0 m. Locate the point (other than infinity) at which the total electric field is zero. I have no clue where to start so any -
## Physics

Three charges are arranged as shown in the figure below. Find the magnitude and direction of the electrostatic force on the charge q = 5.12 nC at the origin. (Let r12 = 0.320 m.) I did the math and for mag i got 1.41E-5 N.for the direction i seem to keep -
## Science

How do people benefit from coastline? -
## Math

Suppose Elina used 15 tiles to make the rectangular design. How many different rectangles could she make with the 15 tiles? Write a list or draw a picture to show the number and dimensions of the rectangles she can make. -
## Art

Please help me I do connexus and this is the last quiz for the semester and I get it wrong then my grade will be a b and my dad will be mad. Individuals can use different criteria to analyze artwork. What would be an example of inappropriate criteria for -
## Art

Please check my work i am in connecus and i can’t add in the pictures but if possible can someone check this. This picture is called “ the wounded foot” and it’s by Joaquin sorolla y Bastida and I really hope someone can check this answer thanks In -
## Literature

I need to write a literature review using the following Research Question: How does one's self attitude/worth play a role in deviant behavior? The following is my outline. I am having two problems. The articles are so complex that I am having difficulty -
## Microeconomic

The accompanying table below shows the demand schedule facing a monopolist who produces at constan marginal cost of $5. Price quatity 9 0 8 1 7 2 6 3 5 4 3 6 2 7 1 8 0 9 a) calculate the firm's revenue schedule -
## Maths / physics

A blue ball travelling at 2m/s hits a red ball at rest on a table. after they collide both balls move in the same direction. Both balls have the same mass. The blue ball continues to move with a reduced velocity of 0.2m/s what is the velocity of the red -
## Physics

A blue ball travelling at 2m/s collides with a red ball at rest on a table. After they collide, both balls move in the same direction. Both balls have the same mass. If the blue ball continues to move with a reduced velocity of 0.2m/s, what is the velocity -
## Math

Write the equation of the ellipse using the given information: The ellipse has foci (–4, 0) and (–4, 4) and vertices (–4, –1) and (–4, 5); -
## Math

Write the equation of the ellipse using the given information: The axis has lengths 2 and 5; the major axis is vertical; and the center of the ellipse is (–1, –2). -
## Math

Write the equation of the ellipse using the given information: The ellipse has foci (4, 1) and (8, 1) and vertices (1, 1) and (11, 1); -
## math

Tom deposits $800 into an account that pays simple interest at a rate of 6% per year. How much interest will he be paid in the first 2 years? -
## Algebra

The perimeter of the larger table is 44 feet. what is the perimeter of the smaller table ? -
## pre Algebra

find the sum of 4, eight times a number and nine times the same number. simplify the expression -
## Analytical Physics II

A charged cloud system produces an electric field in the air near Earth's surface. A particle of charge -2.1 x 10-9 C is acted on by a downward electrostatic force of 4.3 x 10-6 N when placed in this field. (a) What is the magnitude of the electric field? -
## algrebra 1

simplify the square root of ( 18x^2 divided by 50) thank you I tried doing like 9x2x^2 divided by 25 x2...then i got stuck thank you so much...my mom and dad can't help me with this kind of stuff -
## pre algrebra

thank you, Scott or whomever simplify the square root if 108 ok. I got 9x12 which then prime factorization = 2.2.3.3.3 then i get it means the square root of 2.2.3.3.3 but then i get stuck thank you -
## algebra 1

is the set of all positive integers closed under addition? if yes..give 2 examples if no,,,give 2 examples that prove it is not -
## algebra

120 inch length of ribbon is to be cut into three pieces. The longest piece is to be 40 inches longer than the shortest piece, and the third piece is to be half the length of the longest piece. Find the length of each piece of ribbon. -
## math 9th grade

if xy is rational must either x or y be rational -
## help scott biostats

The proportion of deaths due to lung cancer in males ages 15-64 in England and Wales during the period 1970-1972 was 12%. Suppose that of 20 deaths that occur among male workers in this age group who have worked for at least 1 year in a chemical plant, 5 -
## help scott biostatis

The proportion of deaths due to lung cancer in males ages 15-64 in England and Wales during the period 1970-1972 was 12%. Suppose that of 20 deaths that occur among male workers in this age group who have worked for at least 1 year in a chemical plant, 5 -
## Help scott biostats

The value of mammography as a screening test for breast cancer has been controversial, particularly among young women. A study was recently performed looking at the rate of false positives for repeated screening mammograms among approximately 10,000 women -
## biostats

what is the probability by Pr( X ≥ 8) years where X is normally distributed with mean 5.24 and sd = 1.90? HELP!!! thank you! -
## biostats

what 4 values do i need to enter into a box plot graph calculator? median and what else Thanks -
## biostat

based on the data below for a 25 day hospital stay: medical service provided 9 mean of medical services provided 11.11 standard deviation 8.29 surgical services provided 16 mean of surgical services provided 7.19 standard deviation 3.1 is there any -
## biostat

based on the data below for a 25 day hospital stay: males staying in hospital 11 mean of males staying in hospital 8.72 standard deviation 7.91 females staying in hospital 14 mean 8.5 standard deviation 3.48 is the duration of hospital stay affected by -
## biostat

based on the data below for a 25 day hospital stay: 1)patients who received antibiotics 7 mean of patients who received antibiotics 11.57 standard deviation 8.81 patients who did not receive antibiotics 18 mean 7.44 standard deviation 3.7 is the duration -
## biostats

Suppose we divide the patients according to whether or not they received antibiotics, and calculate the mean and standard deviation for each of the two subsamples: answers: x, s, n x sd n Antibiotics 11.57, 8.81, 7 No antibiotics 7.44, 3.70, 18 -
## biostats

If a have calculated 2 standard deviations from a sample of for example 25 day duration in a hospital for 2 groups ( 1 group was given antibiotics , the other group was not given the antibiotics) The standard deviation for group given antibiotic was 8.23 -
## statistics check my work..thank you

Use “service” to assess if there is any difference in duration of hospital stay based on what type of service medical or surgical the patient received during the 25 days in hospital (Key medical=1, surgical=2) what is the sample size, mean and standard -
## statistics check my work

Use gender to assess if there is any difference in duration of hospital stay based on gender. what is the sample size, mean, standard deviation of the males and females during the 25 days in the hospital (key 1=male, 2= female) Duration ........Gender -
## math

In most geometry courses, we learn that there's no such thing as "SSA Congruence" . That is, if we have triangles ABC and DEF such that AB = DE, BC = EF, and angle A = angle D, then we cannot deduce that ABC and DEF are congruent. However, there are a few -
## maths

find the equation of the tangent to the curve 3xy^2 -4+2y=29 at the point (1,3)using implicit differentiation. -
## chemistry

a weather balloon is filled with helium to a volume of 250 l at sea level, where pressure is 760 mm hg. assuming constant temperature, what will be the volume when the balloon raises to a height of 25 km, where the pressure is only 10 mm hg -
## Verbal reasoning

How old is May,if Mary is two years older ,and Robert ,who is a year younger than Mary,will be ten next week? -
## Verbal reasoning

If Tom is taller than Mary ,and Mary is taller than Ann ,who was the shortest ? -
## math

suppose that $2550 is invested in a saving account with a rate of 8.25%. how much interest will be received in 8 years? -
## Chemistry

So this is a three part question. I solved the first part correctly but I need help with the second and third. Q: The dissociation equilibrium constants for the protonated form of of alanine (a diprotic amino acid, H2X+)are Ka1 = 4.6 x 10^-3 and Ka2 = 2.0 -
## Geometry

Given: ΔABC, AB = BC Perimeter of ΔABC = 50 Perimeter of ΔABD = 40 Find: BD BD is the altitude and I got 15, 15+20+5=40 20+20+10=50 -
## Geometry

Two poles of lengths 10 ft. and 15 ft. are set up vertically with their bases on horizontal ground 12 ft apart. Find the distance between the tops of the poles. I got 7.53 ft is this right, if not can you explain and post solution -
## Reasoning

Deborah's father is twice as old she is now.if their ages add up to 45 years how old is Deborah. -
## Social Studies

Maria ivanov has owned a successful clothing boutique chain for 20 years. Sha has gone into debt several times to expand her business.each time she paid off the debt in full sooner than expected. How will Maria's record affect the loans she is offered? She -
## Social Studies

In which h economic situation would interest rate decrease? Most people are saving rather than buying houses••• Average families are choosing to invest in new businesses High consumption is driving a surge in the services sector Increased job -
## Geometry

In rhombus MPKN with an obtuse angle K the diagonals intersect each other at point E. The measure of one of the angles of a ∆PKE is equal 16°. Find the measures of all angles of ∆PKE and ΔPMN. -
## Geometry

The distance from the center of a square to its side is 4 yd. Find the perimeter of the square. if you post the answer it would be a big help -
## Basic Numeracy and statistics (math)

A rocket is shot into the air with an initial velocity of 800m/sec. The equation h = -16t2+144t models the height of the ball. how long does it take for the rocket to hit the ground (h=0)? -
## physics 1

A floating cube is 10 cm on a side and has a density of 800 kg/m^3 . IT is floating in fresh water that has a density of 1000 kg/m^3. what percent of the cube is above the surface of the water? Again, my professor says it is 20%, but how?? -
## physics 1

Glass has a density of about 2500 Kg/m^3. fresh water has a density of 1000 kg/m^3. if a 5 kg block of glass is sitting on the bottom of a freshwater fish tank, what is the normal force on the floor of the tank? 30N is what my professor says is correct, -
## Geometry

How much more pizza is in a 12-in. diameter pizza than an 8-in. diameter pizza? Round your answer to the nearest hundredth. Be sure to show all work and label your answer! -
## Chemistry

How many grams of lithium are required to completely react with 61.9 mL of N2 gas at STP -
## Business

You are shown a coin that its owner says is fair in the sense that it will produce the same number of heads and tails when flipped a very large number of times. -
## Geometry

On the scale drawing of a floor, plan A room is 7 in. long on the scale drawing. Find the actual length of the room. -
## Physical science

Calculate the mass of carbon monoxide that was needed to produce 78 grams of methanol by the following reaction: 2H2+CO=CH3OH -
## Physical science

Determine the number of moles of sodium hydroxide produced when 2 moles of sodium and 3 moles of water react to form sodium hydroxide and hydrogen gas. -
## biochemistry

What is the concentration of H+ in a solution of 0.2 M NaOH? i got [H+] = 5x10^-14, is this correct? all i did was [H+][OH-] = Kw -
## calculus

The region bounded by the given curves is rotated about the specified axis. Find the volume V of the resulting solid by any method. y = −x2 + 7x − 12, y = 0; about the x-axis -
## calculus

Use the method of cylindrical shells to find the volume V generated by rotating the region bounded by the given curves about the specified axis. y = 4x − x2, y = 3; about x = 1 -
## Algebra

Factor: 2x^2 +13x-6 Please give step by step directions. I have tried doing it, but I can't get the right numbers. Thanks! -
## Physics

A 23.7 kg child, with a 4.35 kg backpack on his back, first stands on a sidewalk and then jumps up into the air. Find the net force (positive up/negative down) on Earth due to the child when the child is (c) standing still and (d) in the air. -
## math

A rope goes from one building to another. The distance between the buildings is 10m, and the rope is tied at each building at a point 8m and 4m from the ground. Find the length of the rope. -
## math

List the sides of triangle ΔMNP in ascending order (shortest to longest) if: m∠M = 64°, m∠N = 48°, for this one i am not sure if your supposed to find the third angle and or the third side can you guys explain and show me the answer i got 132 -
## math

In an isosceles triangle, the perimeter is 75 cm and one of the sides is 25 cm. Find all its sides. Can you find all angles of the triangle? Explain your answer. -
## Trig/PreCalc

Find the interior angles of the triangle with vertices (-4,1), (1,-6), and (5,-1) -
## math

if 5 people want to share a 2 pound sack of potato chips equally by weight, how many pounds of potato chips should each person get? -
## Math

A ball is dropped from a height of 16 feet and always rebounds 0.25 of the distance fallen.How high did it rebound the 5th time? -
## Chemistry

Hi, How do you know how many ligands a metal ion needs to form a complex ion? So for example, with (Fe(H20)6)2+, how am I supposed to know that the Fe needs 6 H20's, rather than 4? Thank you! -
## math

determine which ordered pair is not a solution of y = -5x -4 (10, -52) (7,-39) (-7, 31) (8,-44) -
## math

What is the monomial if a cube of a monomial is:1/8 a^27 -
## math

4/9 b^6 writes as a square of a monomial is it (4/9 b^6)/2 -
## Algebra

kx^2-3k+5=0 find the solutions (roots) -
## Math

My sister is 8 years older than I am. The sum of our ages is 26. Find our ages -
## geometry

Prove that the angle bisectors of the base of the isosceles angles of the isosceles triangle are congruent using statement and reason proof i dont really now how to prove this problem but i now what a transversal is and the angles of a trashes line. can u -
## math

find the image of S(-1,-3) after a reflection scross the line y=-2 -
## Office finances

6. What must a depositor add to a check before the bank will accept it for deposit? A. Cancel B. Void C. Endorsement D. Date of deposit -
## chemistry

Pl help...what are the isomers of chlorodibromobenzene -
## chemistry

what are the isomers of chlorodibromobenzene -
## Chemistry

What are the isomers of chlorobromobenzene