# Marth

Popular questions and responses by Marth-
## SS

So... what were the correct answers?

*posted on April 26, 2017* -
## math

6 topping choices, 2 toppings per pizza: 6 choose 2, which is 6!/(2!4!)

*posted on February 21, 2016* -
## computer science

4×512MB = 2GB = 2^31 bytes. To address any byte requires 31 bits.

*posted on February 21, 2016* -
## math

It depends on the distribution of x bar.

*posted on February 21, 2016* -
## Stats/Probability

"Red OR Yellow" should be a giveaway. Here P(A and B)=0 because a red car is not yellow. P(A)+P(B)=0.12+0.04 = 0.16

*posted on February 20, 2016* -
## theoretical probability

There are 2 digits (8,9) greater than 7. So every student has a 1/5 chance of choosing a digit greater than 7. With 25 students, the expected number that choose a digit greater than 7 is 25/5 = 5. I would not say the "predicted" number, but rather the

*posted on February 20, 2016* -
## math

b) He can throw 5 types of pitches each pitch. With 5 pitches, there are 5^5 possible combinations.

*posted on May 20, 2011* -
## computer science

File sizes are given in bytes, while download speeds are given in bits. 4 GB = 4*1024 MB = 4*1024^2 KB = 4*1024^3 Bytes - 4*1024^3*8 bits. 43.2kbps = 43.2*1000 bits per second. The time required is 795.364s, or 220.935 hours. Note that 43.2kbps is quite a

*posted on May 20, 2011* -
## algebra

When the world record is less than 3.1, R is less than 3.1. 3.1 = -0.075t + 3.85 Solve for t (in years after 1930).

*posted on May 20, 2011* -
## Math

The fence forms the perimeter of the rectangle. What is the perimeter?

*posted on May 19, 2011* -
## math

Is the domain of g equal to A? Is the range of g a subset of B? if both are true, then g maps A to B.

*posted on May 14, 2011* -
## Trig- Check my answer Please

What is the length of ? Divide by its length, giving the result a length of 1 - an unit vector.

*posted on May 14, 2011* -
## math

How many inches are in a foot?

*posted on May 14, 2011* -
## math

What is the equation for the volume of a sphere? Try googling it.

*posted on May 14, 2011* -
## math

How could you get only x on the left hand side?

*posted on May 14, 2011* -
## geometry

It doesn't. 100 is not divisible by 6, nor is 83 divisible by 5.

*posted on May 14, 2011* -
## Math

13 is a good guess. But when in 2011 do they actually turn 13?

*posted on May 14, 2011* -
## math geometry

Use Pythagorean Theorem. a^2 + b^2 = c^2, where c is the hypotenuse of the right triangle.

*posted on February 14, 2011* -
## Math

Find the slope and y intercept of each, and compare. m = (y1-y2)/(x1-x2) to find the slope. y - y1 = m(x-x1) to write the line in slope-intercept form.

*posted on February 9, 2011* -
## Algebra

You can factor out a 4a from each term.

*posted on February 3, 2011* -
## MATH

No two numbers add to 50. Therefore we must use at least 3 numbers to get the sum. 25+19+6 = 50: a solution exists for 3 numbers.

*posted on January 27, 2011* -
## Math Algebra 2

Substitute in the values of p and r. p = 10 r = -4 p^2 - r^2 = (10)^2 - (-4)^2 = ?

*posted on January 27, 2011* -
## math

(1/8)-(1/8)2+(1/8)3 = (1/8)(1-2+3) by factoring.

*posted on January 26, 2011* -
## College Algebra

Correct

*posted on January 22, 2011* -
## beginning algebra

2 + 7/y = 3/5 7/y = 3/5 - 2 y/7 = 1/(3/5 - 2)

*posted on January 22, 2011* -
## algebra

y - y1 = m(x - x1) The point (x1, y1) is given as (4, -5). The slope m is given as -3.

*posted on January 20, 2011* -
## algebra

The probability that Jonas gets an orange is 5/11. Given that Jonas gets an orange, the probability that Beth gets an apple is 4/10. So the probability that Jonas gets an orange and Beth gets an apple is (5/11)*(4/10).

*posted on January 20, 2011* -
## Geometry

Let x and y be the sides. By Pythagorean Theorem, x^2 + y^2 = 600^2. x+y+600 = 1400

*posted on January 18, 2011* -
## MATH

881/5 = 880/5 + 1/5

*posted on January 18, 2011* -
## Math

To find the inverse, swap f(x) and x: f(x) = 10x-5 x = 10f^-1(x)-5 Now solve for f^-1(x).

*posted on January 18, 2011* -
## Math

Elaine takes 2.8s more than Pamela: Elaine takes 2.8s + 52.3s =

*posted on January 18, 2011* -
## Algebra

x^2-6x-3=0 x = (-b +/- sqrt(b^2-4ac))/(2a) x = (6 +/- sqrt(6^2 - 4(1)(-3)) ) / (2(1))

*posted on January 16, 2011* -
## Math

Set up a proportion: 8%/56 = 100%/x

*posted on January 16, 2011* -
## algebra

Plug the values in. h = 50m t = 2s v = 30m/s h+vt+4.9*t^2=?

*posted on January 15, 2011* -
## physics

V=d/t d=V*t Let t be the time the man is jogging. t-2 is the time the dog is running (since the dog waits 2s). When they catch up with each other displacement will be equal. (4m/s)(t-2)=(1.8m/s)(t)

*posted on January 15, 2011* -
## math

The difference of two squares is a^2-b^2, for a and b any expression. It should be easy to determine if a polynomial fits that form.

*posted on January 15, 2011* -
## Preap Physics!!

There are several types of potential energy - spring potential energy, chemical potential energy, etc.

*posted on January 11, 2011* -
## math

If the relationship is linear, then the line formed by any two points will pass through all points. Find the line through the first two points. Then check to see if the rest of the points are on that line.

*posted on January 11, 2011* -
## algebra

There are two solutions because of the absolute value sign. x-3x+5 = 7 or x-3x+5 = -7

*posted on January 11, 2011* -
## algebra 2

yes

*posted on January 10, 2011* -
## algebra

Jeffs car takes 20% less gas, so it gets 21/(1-0.2) miles per gallon. To drive 570 miles at 21 miles per gallon requires 570/21 gallons.

*posted on January 10, 2011* -
## algebra 2

You can factor out 4x from both terms.

*posted on January 10, 2011* -
## math

Teaching makes you learn something well. You've had scientific notation in class, right? Pretend I don't know scientific notation, and explain to me what it is. (That will be your answer).

*posted on January 10, 2011* -
## MATH 12 HELP!!

There are 15 choose 4 ways to choose 4 toppings. There are 15 choose 2 ways to choose salami, green pepper, and 2 other toppings. P{salami and green pepper) = C(15, 2) / C(15,4).

*posted on January 9, 2011* -
## Algebra 2

Use synthetic division with -3, then factor the remainder.

*posted on January 9, 2011* -
## Algebra

Let x be the amount of time of the breakeven point. Then 84+50x = 60x.

*posted on January 9, 2011* -
## Math: Algebra 2

Try factoring out (2x-3) through grouping.

*posted on January 9, 2011* -
## algebra

f(x) = 2x^2-3x f(0) = 2(0)^2-3(0) = 0 f(-1) = 2(-1)^2-3(-1) f(2)=?

*posted on January 9, 2011* -
## algebra 2

The zeroes are 1, 2, and 3, so the factors are (x-1), (x-2), and (x-3). Those are 3 factors for a 3rd degree polynomial, so no other factors are needed. f(x) = C*(x-1)(x-2)(x-3), where C is any constant. f(0) = 18 allows you to determine C.

*posted on January 9, 2011* -
## math

Let a be the value of "a", e be the value of "e", etc. for i, o, and u. Audacious has a u a i o u = 260. So 2a+i+o+2u = 260. Do the same for the other 4 words; you have 5 equations for 5 variables.

*posted on January 9, 2011* -
## geometry

The diagonal forms a right triangle with 2 sides of the square. The sides are of equal length, so you can use Pythagorean Theorem to find a side of the square.

*posted on January 9, 2011* -
## Math

Suppose you buy x shirts to be shipped as one order. What is the cost of the shirts? What is the cost of shipping?

*posted on January 9, 2011* -
## math analysis

If csc(x) = 30/150, sin(x) = 150/30. That is not in the range of sine.

*posted on January 9, 2011* -
## Calculus

The derivative of ln(u) is u'/u. Use Chain Rule for the rest.

*posted on January 9, 2011* -
## Algebra

What variables did you use in part a?

*posted on January 9, 2011* -
## math

The points at the tail of the skew affect the mean, but the median will remain in the middle of the curve.

*posted on January 9, 2011* -
## Math

Try writing an equation for each problem. It's easy to make a mistake while glancing over the answer choices.

*posted on January 9, 2011* -
## Algebra II

x^2+2x-3 factors into (x+3)(x-1). You can divide x^4-5x^3-16x^2+23x-3 by (x+3) and (x-1) using synthetic division, which may be easier.

*posted on January 9, 2011* -
## Math

Use L'hopital's Rule.

*posted on January 7, 2011* -
## algebra

-2x-

*posted on January 7, 2011* -
## Math

The player makes 60% of the shots. So the odds are 60:40 in favor of her making the first shot.

*posted on January 6, 2011* -
## physics

q1 exerts a force on q in the positive direction, and q2 exerts a force on q in the negative direction. F = k(q1q2)/r^2 is the force exerted on one point charge by another. ΣF = k(q*q1)/(0.24)^2 - k(q*q2)/(0.37)^2 = 24. q and q1 are given. q2=?

*posted on January 6, 2011* -
## math

a > b = "a is greater than b" a < b = "a is less than b"

*posted on January 6, 2011* -
## algebra

What is your question?

*posted on January 6, 2011* -
## Physics-Please check

1) Yes, the gravitational force diminishes the farther you get, but by what factor? Check the equation. 2) The speed of the earth keeps it in orbit around the sun. Changing the mass changes the gravitational force, which is also the centripetal force for

*posted on January 5, 2011* -
## math

Pythagorean Theorem: a^2 + b^2 = c^2 c is the hypotenuse

*posted on January 5, 2011* -
## math

You gain $3 if you get a 6, and always pay $0.90. E[X] = (1/6)*3 - $0.90

*posted on January 5, 2011* -
## algebra

What is your question?

*posted on January 5, 2011* -
## Math

Yes

*posted on January 5, 2011* -
## algebra

25% was marked off the original price of $88.

*posted on January 4, 2011* -
## fraction x whole number

7/10*30 = 7/10*10*3 = 7*3 = 21

*posted on January 4, 2011* -
## algebra

If |3n+5| = 7, then 3n+5 = 7 or 3n+5 = -7. There are two possibilities for n; find both.

*posted on January 4, 2011* -
## Math

18 < 20-w 18-20 < 20-w-20 -2 < -w Flip the inequality sign when multiplying by -1. 2 > w

*posted on January 4, 2011* -
## science

The boiling point and condensation point are identical.

*posted on January 4, 2011* -
## Math

Numbers are ascending left to right. Is -7 to the left or to the right of -6?

*posted on January 4, 2011* -
## Math

Yes

*posted on January 4, 2011* -
## Math

x+8 < 11 x+8-8 < 11-8 x < 3 Inequalities are almost like regular equations.

*posted on January 4, 2011* -
## math

Ok. Then the perimeter of the triangle is w + l/2 + 5. So w+l/2+5 = 12m, and 2(l+w)=22m.

*posted on January 4, 2011* -
## Math

Draw a number line, and label -7 and -6.

*posted on January 4, 2011* -
## math

Let x be the amount of money Beth has. Let y be the amount of money Suzy has. "beth has $0.60 more than suzy." x = 0.60+y. "together they have $8.20." x+y = 8.20 Solve the system of equations.

*posted on January 4, 2011* -
## Math pre-algebra

3/1.65 = 5/x

*posted on January 4, 2011* -
## Math

This is a simple triangle problem - it may help to draw it out. Draw the height perpendicular to the ground, and the ramp is the hypotenuse. The solution is a proportion. Let x be Pam's height. Then 15/9 = (15+20)/x. x=?

*posted on January 4, 2011* -
## math

Is the base of the triangle the width of the rectangle, and the height of the triangle half the length of the rectangle?

*posted on January 4, 2011* -
## Math

x+8

*posted on January 4, 2011* -
## Math

10-4(5x+1) Distribute the 4 =10-20x-4 =6-20x

*posted on January 4, 2011* -
## math

Are you referring to the triangle formed by the diagonal of the rectangle and two of its sides? If the dimensions are 8m by 3m, the hypotenuse of said triangle cannot be 5m.

*posted on January 4, 2011* -
## Math

I appreciate trying to help, but please work out the problems to show how the answer is reached. (It also helps to check your work). Standard form of a line is ax+by = c, with a, b, and c integers. y+2 = (1/2)(x-4) Distribute the (1/2). y+2 = x/2-2

*posted on January 4, 2011* -
## Pre-Algebra

12+5 > y-5+5 17 > y

*posted on January 4, 2011* -
## math

The perimeter of the rectangle is 22m. So 2(l+w) = 22. l+w = 11 l = 11-w Also, l^2+w^2 = 5^2 by Pythagorean Theorem. Substitute in l = 11-w: (11-w)^2+w^2=5^2

*posted on January 4, 2011* -
## algebra

6.67*10^-11 = 6.67/10^11

*posted on January 4, 2011* -
## algebra

Substitute in x = 35-5y in 4x+9y = 52. 4(35-5y)+9y = 52 Solve for y. Then, plug the value of y into either of the original equations to find x.

*posted on January 4, 2011* -
## Math

Factoring the tens is a technique for mental multiplication which relies on the fact that 10*n, for any real number n, is easy to compute. 6*2 = 12 is a memory value. 6*20 = 6*2*10 = 12*10 = 120 60*20 = 6*10*2*10 = 12*10*10 = 1200

*posted on January 4, 2011* -
## Math

2+m < 2 2+m-2 < 2-2 m < 0

*posted on January 4, 2011* -
## math

(2/5)Q

*posted on January 4, 2011* -
## math

Let l be the length, and w be the width, of the rectangle. The perimeter of the rectangle is 2(l+w). The perimeter of the triangle is l+w+sqrt(l^2+w^2). sqrt(l^2+w^2) is the hypotenuse of the triangle. There are two equations and two variables. Find l and

*posted on January 4, 2011* -
## Math/Trig

The period of the parent function is 2pi. The factor of 1/2 applied to x changes the period to 2pi/(1/2) = 4pi.

*posted on January 4, 2011* -
## Math

t is the price of the movie ticket. We know that 3 tickets is less than twenty dollars, because the student got change back. 3t < 20

*posted on January 3, 2011* -
## algebra

Given the slope m and the point (x1, y1), use the equation y-y1 = m(x-x1) to find the equation of the line.

*posted on January 3, 2011* -
## math

8*5*9 = 4*2*5*9 = 4*10*9 = 36*10 = 360

*posted on January 3, 2011* -
## math

That is an expression. What is your question?

*posted on January 3, 2011*