All Questions

2170

Seven sticks with lengths 2, 3, 5, 7, 11, 13 and 17 inches are placed in a box. Three of the sticks are randomly selected. What is the proba

Seven sticks with lengths 2, 3, 5, 7, 11, 13 and 17 inches are placed in a box. Three of the sticks are randomly selected. What is the probability that a triangle can be formed by joining the endpoints of the sticks? Express your answer as a common fraction. read more ..

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Guest Dec 30, 2018

658

how many times does five fit in to four dollars

tertre ●●

Guest Dec 30, 2018

2766

Ryan has 3 red lava lamps and 3 bl…..

Ryan has 3 red lava lamps and 3 blue lava lamps. He arranges them in a row on a shelf randomly, and then randomly turns 3 of them on. What is the probability that the leftmost lamp is blue and off, and the rightmost lamp is red and on?

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Guest Dec 30, 2018

729

+845

summation series

not quite sure about what the 3 infront of the symbol means please help
i have tried subbing in 3r but it doesnt work

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YEEEEEET Dec 30, 2018

-1

2715

help

In the diagram, four circles of radius 1 with centres P, Q, R, and S are tangent to one another and to the sides of , as shown.
The radius of the circle with center R is read more ..

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Guest Dec 30, 2018

782

+816

Help!

Two parabolas are the graphs of the equations $y=2x^2-10x-10$ and $y=x^2-4x+6$.. Give all points where they intersect. List the points in order of increasing $x$-coordinate, separated by semicolons.

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mathtoo Dec 30, 2018

927

PLZ HELP

Queen Zubaida wishes to choose a Satrap and a Vizier from among her 12 courtiers. How many different ways can she assign the two roles, assuming the same person cannot fulfill both roles?

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Guest Dec 30, 2018

698

+166

Last one

Evaluate the sum

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grif389 Dec 30, 2018

725

+166

Help please

If x, y, and z are positive real numbers satisfying:
log x - log y =a
log y - log z = 15
log z - log x = -7 read more ..

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grif389 Dec 30, 2018

853

+166

Urgent

Find the common ratio of the infinite geometric series:
5/6 - 4/9 + 32/135 - ...

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grif389 Dec 30, 2018

1424

Hypergoematric Distribution

Q#1 Suppose a researcher goes to a small college of 200 faculty, 12 of which have blood type O-negative. She obtains a simple random sample of size n = 20 of the faculty. Let the random variable X represent the number of faculty in the sample of size n = 20 read more ..

off-topic

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Guest Dec 30, 2018

886

why tan(90)=inf

why tan(90) equals infinity?

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Guest Dec 30, 2018

1757

+166

Help

The graphs of a function f(x)=3x+b and its inverse function f^-1(x) intersect at the point (-3,a). Given that b and a are both integers, what is the value of a?

Find the common ratio of the infinite geometric series:
5/6 read more ..

Omi67 ●●

grif389 Dec 30, 2018

631

Finance question help

Suppose $70,000 is divided into two bank accounts. One account pays 10% simple interest per year and the other pays 5% simple interest. After three years, there is a total of $1,451.25 in interest between the two accounts. How much was invested into each read more ..

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Guest Dec 30, 2018

Dec 29, 2018

891

+816

passing through a point

A parabola with equation passes through the points (2,3) and (4,3). What is c?

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mathtoo Dec 29, 2018

942

+816

Graphs of Parabola

The graph of the parabola has an x-intercept (a,0) and two y-intercepts (0,b) and (0,c). Find a+b+c.

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mathtoo Dec 29, 2018

705

+845

stationary point rational function

ONLY 5C PLEASE
ok so for this question i have showed one of the coordinate is (1,0) what im struggling with is the other stationary point.
i simplified the rational function read more ..

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YEEEEEET Dec 29, 2018

888

+816

Quick Question

The height (in meters) of a shot cannonball follows a trajectory given by at time (in seconds). As an improper fraction, for how long is the cannonball above a height of meters?

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mathtoo Dec 29, 2018

556

help

Suppose we are given seven points that are equally spaced around a circle. If P, Q, and R are chosen to be any three of these points, then how many different possible values are there for ?

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Guest Dec 29, 2018

2052

+55

Really need some help with a chemistry problem.

M2R3 and TS2 are both ionic compounds. When 20.0 mL of a 1.0 M solution of M2R3 and 50 mL of a 1.0 M solution of TS2 are mixed, two precipitates are formed. After the Reaction has gone to completion, what ions remain in the solution?
read more ..

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Cent0rea88 Dec 29, 2018

1432

+884

help

At a certain amusement park, there is a bulk discount for tickets. If you buy up to 60 tickets in one order, the price for each ticket is $70. However if you buy more than 60 tickets in a single order, the price of every ticket is reduced by read more ..

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ant101 Dec 29, 2018

672

+845

Method of difference part b

i think for this question i am supposed to use my answer from the last post which is
f(r+1) - f(r) = 6(r+1)^2 i have done this with summation series but it is not what read more ..

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YEEEEEET Dec 29, 2018

708

+845

method of difference

for this question first i identified (r+1)^2 = r^2+2r+1
i subbed in r+1 into r which gave me f(r+1)= 2r^3 + 8r^2 + 13r + 6
then subtracted the expanded version read more ..

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YEEEEEET Dec 29, 2018

All Questions ⁺⁰230606 Questions

Seven sticks with lengths 2, 3, 5, 7, 11, 13 and 17 inches are placed in a box. Three of the sticks are randomly selected. What is the proba

how many times does five fit in to four dollars

Ryan has 3 red lava lamps and 3 bl…..

summation series

help

Help!

PLZ HELP

Last one

Help please

Urgent

Hypergoematric Distribution

why tan(90)=inf

Help

Finance question help

passing through a point

Graphs of Parabola

stationary point rational function

Quick Question

help

Really need some help with a chemistry problem.

help

Method of difference part b

method of difference

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