# Posts by John

Total # Posts: 8,488

**Algerba 2**

A football is kicked into the air. Its height in meters after t seconds is given by h=-5(t-2)^2+20 What was the height of the football when it was kicked? Is it right the y intercept is 0,0 and x intercept is (0,0) and (4,0)?

**algebra**

Write the equation of the line with slope m = 2 and passing through (8,20). Write your equation in the form y=mx+b y=

**algebra**

It takes Maggie 20 min to drive to work in the morning. She drives home using the same route, but it takes 13 min longer, and she averages 8 mi/h less than in the morning. How far does Maggie drive to work?

**PreCalc**

QP is (x y) = (3 -1) + r (14 10) QR is (x y) = (3 -1) + s (17 -9) PR is (x y) = (0 18) + t (5 -7) where r, s, and t are scalars. 1. Use vector methods to find the coordinates of P, Q, and R. 2. Find vectors PQ and PR and evaluate PQ*PR 3. Find size of QPR 4. Find the area of ...

**PreCalc**

QP is (x y) = (3 -1) + r (14 10) QR is (x y) = (3 -1) + s (17 -9) PR is (x y) = (0 18) + t (5 -7) where r, s, and t are scalars. 1. Use vector methods to find the coordinates of P, Q, and R. 2. Find vectors PQ and PR and evaluate PQ*PR 3. Find size of QPR 4. Find the area of ...

**Chemistry**

Can someone please help? How much total energy is emitted from a collection of 2.50 moles of H atoms if each atom is emitting a photon with a wavelength of 96.7 nm? I believe you must first use wavelength=plank constant/ mass of object times velocity, then use energy=plank ...

**science**

You probs mean 0.5 M. M= mol/L. Find the number of moles, convert to grams. Prepare grams in solution.

**calculus**

Differentiate the function.((x^2)-((3x^2)(ln(4x))))/(x^6)

**Organic Chemistry Lab**

Give all the products that you would expect by reaction of 2-bromo-3,4-dimethylbutane with methanol. Explain your answer. Thank you

**Math**

To travel 88 miles, it takes Sue, riding a moped, 4 hours less time than it takes Doreen to travel 72 miles riding a bicycle. Sue travels 13 miles per hour faster than Doreen. Find the times and rates of both girls. Doreen _ mph for _ hr Sue _ mph for _ hr

**Math**

Maria ate 1/3 of a pie. Her sister ate 1/5 of what was left. What fraction of the whole pie did her sister eat?

**Chemistry**

Re: Qualitative analysis - group 1 cations lab What single reagent could you add that would allow you to differentiate between the members of each pair of solid compounds below? Tell what happens to each substance when the reagent is added and show a balanced net ionic ...

**Math**

The combined area of a square and a rectangle is 124 square centimeters. The width of the rectangle is 4 centimeters more than the length of a side of the square, and the length of the rectangle is 2 centimeters more than its width. Find the dimensions of the square and the ...

**Physics**

1. Start from rest with constant acceleration of 2.11 m/s2 for 20.0 s. 2. Maintain a constant velocity for the next 2.75 min. 3. Apply a constant negative acceleration of ?8.44 m/s2 for 5.00 s. (a) What was the total displacement for the trip? Please explain with steps and an ...

**Chemistry**

9.3mL of ammonia base cleaner requires 12mL of 1M HCL to reach end point. A) what is molarity of ammonia and b) what is percentage of ammonia

**biology**

Why do you think the protocol does not say to dissolve compounds directly in 1 liter of water?

**Algebra**

Suppose that you have a supply of a 30% solution of alcohol and a 70% solution of alcohol. How many quarts of each should be mixed to produce 40 quarts that is 40% alcohol?

**physical**

calculate the force of gravity on a 1.2 x 10^5 kg space station at a distance of 3.5 x 10^5 m from earth's surface earth equal to 5.98 x 10^24 kg

**Calculus1**

Differentiate the function. y = ((4x^2 + 8x + 4)÷?(x)) x

**trigonometry**

FROM THE SKYDOME IN SM NORTH WHICH DIRECTLY ACROSS THE STREET, THE ANGLE OF ELEVATION OF TRINOMA IS 57°20' AND THE ANGLE OF DEPRESSION OF THE BASE IS 18°10'. IF THE BUILDING ARE 105 METERS APART, WHAT IS THE HEIGHT OF THE BUILDING?

**trigonometry**

FROM THE SKYDOME IN SM NORTH WHICH DIRECTLY ACROSS THE STREET, THE ANGLE OF ELEVATION OF TRINOMA IS 57°20' AND THE ANGLE OF DEPRESSION OF THE BASE IS 18°10'. IF THE BUILDING ARE 105 METERS APART, WHAT IS THE HEIGHT OF THE BUILDING?

**Math, Algebra II**

One-third of Connor's age is 11 years less than his age 13 years ago. How old is Connor?

**calculus**

Differentiate the function. f(x) = e^7

**Science**

What is the goal of technology A.to understand the natural world B.to improve how devices operate C.to improve how people live D.to understand how systems operate My answer A

**trigonometry**

A man standing 9m above the ground,observes the angle of elevation and depression of the top and bottom of Rizal monument in luneta as 6° 50' and 7° 30' respectively find the height of the monument

**physical**

staring from rest, a 3.5 kg object is acted upon by an unbalanced force and acquires a speed of 14.0 m/s after moving a distance of 35 m. find (a) the acceleration of the object, (b) the unbalanced force acting on the object, and (c) the time it takes for the object to attain ...

** physical**

a ball that was projected up at an angle of ? degrees with the horizontal has a flight time of 5.0s and covers a range of 49.0 m. find (a) the time it took to reach maximum height, (b) the horizontal and vertical components of its initial velocity, (c) its initial velocity,(d...

**math**

Simply using laws of logarithms 2log8^2+2log8^3 I tried this question I failed

**physics science**

a ball thrown vertically upward lands on the thrower's hand 24.5s. find (a) the time taken by the ball to reach its maximum height,(b) the maximum height attained by the ball, and (c) initial velocity of the ball

**Math**

please help with this question .Name two planes that intersect in UV in the figure to the right. I have a diagram to post as well is their a way to post it here ?

**science**

PV/T = constant. As pressure increases, volume decreases As volume increases, pressure decreases As temperature increases pressure increases As temperature increases volume could increase, but this is a closed system. I like the last choice.

**Math**

If this is a triangle then they sum to 180 degrees 4x+ 123 -5x-3 + 6x + 105 = 180 5x + 225 = 180 find x and then substitute the value into -5x -3 to find <DPC

**math**

9 - 31 9 + (-31) take the difference -22 degrees.

**math**

Two motorcycles are at the two ends of a road right next to a wall behind them (walls and road are perpendicular. They start heading towards one another in the opposite directions on two straight and parallel lines.Each vehicle has a constant velocity but one is faster. They ...

**math**

Three friends have 1/2 a pizza left. If they divide it evenly, what fraction of a pizza will each friend get?and i already tried and i didnt understand

**composite functions**

replace the x with the function. g of (f(x)) 2/(3(x+4/x) -1 I am not sure the g(x) is (x+4)/x or is is x plus 4/x that matters when simplifying.

**MATH w/steps**

12/120 + 10/120 - 6/120 16/120 = 1/x 120/16 = x 15/2 =x

**Math-college**

You can't set each part equal to 7. That only works when you set each part equal to 0. Using zero works because we know if something times something = 0 then one of the factors has to = 0. multiply first x2 -x -12 <7 x2 -x - 19 <0 Now, you can finish the problem.

**maths**

This can be done with a Venn Diagram with two intersection circles. If 17% failed both.. that goes into the overlap. then 35% failed English and 31% failed math. Got this by subtracting the 17% from both given values. Now.. some 17, 35 and 31 and subtract that answer from 100...

**biology**

You have to know the volume to find the density. density = mass/volume

**Science**

Generation and conduction of postsynaptic potentials and Integration of postsynaptic potentials and generation of action potentials How can these two relate to football players? Your thoughts?

**Calculus**

Would dc/dx=0 when x is 1.16?

**Calculus**

A rectangular storage container with an open top is to have a volume of 10 . The length of its base is twice the width. Material for the base costs $12 per square meter. Material for the sides costs $5 per square meter. Find the cost of materials for the cheapest such container.

**algebra**

Jennny decided to open up her new coffee shop. Jenny needs to know how much he will need to bring in with the coffee shop to keep up with costs and revenue. With this problem, we have to make the problem into this: profit=the revenue- the cost of the buildings coffee they ...

**maths**

The height of cuboid is 4 cm and the volume of the cuboid is 60 cm^3.What is the area of the shaded face?

**math**

An apartment building has 15 apartments in it. The tenant association is having a hard time collecting the fees from the tenants with an 0.6 probability of a tenant paying their fees. What is the probability of tenant association collecting fees from 11 out of the tenants ? ...

**math**

An apartment building has 15 apartments in it. The tenant association is having a hard time collecting the fees from the tenants with an 0.6 probability of a tenant paying their fees. What is the probability of tenant association collecting fees from 11 out of the tenants ?

**science**

2 hydrogen = 2 g 1 Oxygen = 16 g 18 grams so you had 9 grams 9/18 = 1/2 is the proportion. This would be 1/2 of a mole of water. or are you asking the proportion by mass of H to O 2/16 = 1/8

**math**

In a college, 30 students are taking a math class and 20 students are taking an English class. 5 students are taking both English and math. How many students are taking either English or math.

**Math, algebra**

1. If $x <> (sqrt xy)/(|x-y|), find 4 <> (9 <> 1) to the nearest tenth. <>=diamond This is a function, where the "diamond" represents a function. 2. If f(x) = 3x^2 - 5, what is the value of f(f(-1))?

**Stats need help**

Use the empirical rule to solve the problem. The systolic blood pressure of 18 yr. old women is normally distributed with a mean of 120 mmHg (millimeters of Mercury) and a standard deviation of 14 mmHg. What is the percentage of 18 yr. old women that have a systolic blood ...

**Stats Help Help**

Find the variance for the given data. Round your answer to two decimal places. 5.0, 8.0, 4.9, 6.8, and 2.8

**Discrete or continuous help**

Identify the given random variable as being discrete or continuous. The number of stories in a specific Manhattan office building.

**STATISTICS**

Determine which of the four levels of measurement is most appropriate. Heights of survey respondents.

**STATISTICS**

A bag contains 5 purple marbles, 7 yellow marbles, and 3 orange marbles. If two marbles are selected from the bag: What is the probability that a yellow then an orange are chosen without replacement.

**RE: MathMate**

Ok thanks so I did answer the question correctly.

**math**

Consider the two inequalities 3x + 2y ? 4 9x + 8y ? 14 2y ? -3x + 4 2y/2 ? -3x/2 + 4/2 y ? -3x/2 + 4/2 y ? -3x/2 + 2 slope -3/2 y- intercept 2 The black line is y ? -3x/2 + 2 8y ? -9x + 14 8y/8 ? - 9x/8 + 14/8 y ? -9x/8 + 14/8 y ? - 9x/8 + 7/4 slope -9/8 y- intercept 7/4 The ...

**Algebra**

If x + (1/x) = a Find these in terms of a: x^2 + (1/x^2) and x^3 + (1/x^3) I got a^2 and a^3 as my answers, but the book says a^2 - 2 and a^3 - 3a. How did they get that?

**Algebra**

What I don't understand about this problem is that what the letters mean? I am sorry I forgot the + d at the end.

**Algebra**

Find a trigonometric equation in the form y = a sin (b (x-c)) which has a minimum of (3, -5) and a zero value of (6, -1). There is a graph with the minimum and the zero value labeled. It is wavy with suggests that it is a sin curve.

**Algebra**

Solve 3^2x+1 = 5(3^x) + 2 I would know how to solve it if it was only 3^2x+1, but now it seems more complicated.

**hookle's law**

50 N/25 cm = 100 N/?? cm 50 cm stretch + 20 cm = 70 cm

**math-probability**

To win first prize, he has a 1/500 chance to win first and 3rd. Assume he wins the first prize which is 1/500 then chance of winning 2nd is 1/499 and chance of winning 3rd is 1/498 to get to your ANDS multiply the two probabilities.

**Maths**

b.Find the seventeenth term of an Arithmetic Progression, whose 9th and 15th term are 19 and 37 respectively.

**statistics**

At one college, GPAs are normally distributed with a mean of 2.6 and a standard deviation of 0.6. What percentage of students at the college have a GPA between 2 and 3.2?

**Math - error NOT 2**

It said NOT 2; therefore, the product of 1/2 times 5/6 would be your answer

**Science**

Consider a lead-acid battery with 500 Ah capacity and a rated voltage of 12 V. a)What is the total capacity of energy in watt-hours that can be stored in the battery? b)Assume that the battery is completely empty. The battery is now charging at a C-rate of 0.20C. What is the ...

**politics**

I agree!!

**chemistry**

honey is more dense than ink.

**chemistry**

If temperature increases, rate of evaporation increases. If it is more humid, the rate of evaporation decreases.

**Social Studies**

I bet if you do a google search of the McCarran Act, you will find the answer very quickly.

**science**

Carbon, hydrogen, oxygen, nitrogen, sulphur, phosphorus, boron, chlorine, flourine, iodine etc. are the non-metals Sodium, potassium, magnesium, calcium, cobalt, manganese, iron, zinc, tin, molybdenum, vanadium etc. are the metals.

**Math**

Answer = 6 1176 = 2*2*7*7*(3*2) 1176 = 4 × 49 * (6) In above eqn, 4 and 49, both are perfect squares, but 6 isn't. So if we multiply 1176 by 6 (i.e. 1176 * 6 = 7056) we get 7056, which is a square of 84.

**science**

For every action there is an opposite and equal reaction. By adding Na2CO3 that will give you the CO3 which will push the reaction to form more CaCO3

**Math**

Multiply the two binomials. x^2 + 2x + 4x + 8 simplify from here and that will be your answer. area = l x w

**Math**

r = 4g r + g = 75 4g + g = 75 5g = 75 g=15 4g = 60 red.

**Civics**

I agree

**algebra**

-b +-sq root of b^2-4ac all of this divided by 2a 2 +- sq root (-2)^2 -4(1)(8) all divided by 2(1) 2 +- sq root 4-32 2+- sq root -28 all divided by 2 2+- 2i sq root of 7 comes from 4(-1)(7) all divided by 2 reduces to 1 +i sq rt 7, 1-i sq rt 7 are the roots. or are the values ...

**Algebra**

m = change in y/change in x m = (12-15)/(7-4) = -3/3= -1 Perpendicular lines have slopes that multiply to -1. If slope = 1/2 perpendicular = -2 In this case -1 perpendicular is 1.

**History**

I think it is D.

**Maths**

24/26 = 12/13

**Science**

The green revolution depended on A) new biodegradable pesticides. B) high-yielding grain varieties. C) clearing forest for crop land. D) organic fertilizers.***

**math science geography**

A resultant force of 15.00n acts on a body for 4s mass 4kg. calculate the change in momentum of the body within this period

**Math 6b**

The nu1/3mbers are 1 2 3 4 5 6 even numbers are 2 4 6 then it says not 2 4 6 is left which is 2/6 =

**Science**

How do global positioning systems use elevation points on Earths system to find latitude and longitude A. By using signals from a network of satellite B. By using topographic maps C. By using satellite images D. By using photography

**Science**

Do global positioning systems use elevation on Earths system to find latitude and longitude A. By using signals from a network of satellite B. By using topographic maps C. By using satellite images D. By using photography

**Physics**

speed = wavelength/frequency 340m/sec = 3m/ frequency can you finish from here? 3 times 340 with units of seconds.

**MATH**

2 happened 4 times 4 happened 9 times 6 happened 2 times 15/24 or 5/8 The theoretical probability would be 3/6 or 1/2 since half the numbers are even.

**stats help **

A scratch-card costs 5¤ and has two possible prizes. There is a 10% chance you get 5¤ back and a 1% chance you get 100¤. In all other cases, you get nothing. Let X denote your net winnings, i.e, (X = prize - cost). What are the expectation and standard ...

**math**

90

**statistics**

find n if c(n,3)=120

**Geography**

In which category should Atomic energy be placed, conventional source of energy or non conventional source of energy ? Please explain your answer ! Thanks

**Chemistry**

I need help balancing this acidic equation out with reduc/oxidation. Mn+2 (aq) + NaBiO3(s) -----> Bi+3(aq) + MnO4-1(aq)

**science**

I agree with B.

**Algebra 2 check **

The graph of y =1/x is vertically stretched by a factor of 3, re?ected across the y-axis and shifted to the left by 2 units. What is the function of the resulting graph? y=3/x-2 y=-3/x+2 y=1/3x-6 y=-1/3x+6 my answer is B

**Algebra 2 struggle**

How is the the graph of y=1/2x-6 obtained from the graph of y=1/x ? A) Vertically stretched by a factor of 2 and shifted right by 3 units. B) Vertically stretched by a factor of 3 and shifted right by 2 units. C) Horizontally stretched by a factor of 2 and shifted left by 3 ...

**science**

20 + 25 divided by 2 to find the average.

**physicccccccccccccc**

this is not the answer for my question,i think nobody knows my question

**physicccccccccccccc**

I did answered my question but not sure weather is correct or not 1)How is X-ray produced and why can it be used to help us see the structure inside the body? X-rays are produced when electrons strike a metal target. The electrons are liberated from the heated filament and ...

**Statistics**

There are 8 possible outcomes 2^3 Since you either have a head or a tail and 3 coins. 2/8 or 1/4 HHH or TTT 6/8 or 3/4 for the other choices. 1/4 times 5 - 3/4 times 3 -$1