Help my sister step by step show work so she can understand because I forgot how to do this stuff

Mathematics

1 answer:

nikdorinn [45]3 years ago

8 0

The volume of this shape is 960

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What is the value of x-y if x= -1/5 and y=7/15

Vitek1552 [10]

The answer to this problem is -0.66666

6 0

3 years ago

This school is also thinking of changing their mascot to an armadillo. To change mascot, a 55% supermajority is needed. How many

Dennis_Churaev [7]

Answer:

132 students

Step-by-step explanation:

100% means all of something, so 100% can also be written as 1.00

Since we need 55% of 240, we can multiply 240 by 0.55 and get 132.

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3 years ago

4:3 and 25:45 are equal ratios true or false

kondaur [170]

False.

The scale factor for 3 and 45 is 15.

45 / 3 = 15.

We know that 25 isn't even a whole number for the scale factor, because no number x 4 can equal 25 (whole numbers only).

25 / 3 = 6.33333

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3 years ago

QUESTION: WHATS BETTER <br><br> APPLE JUICE OR ORANGE JUICE

alexandr1967 [171]

Answer:

orange juice is better than Apple Juice

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2 years ago

Find the solution of the given initial value problem:<br><br> y''- y = 0, y(0) = 2, y'(0) = -1/2

igor_vitrenko [27]

Answer: The required solution of the given IVP is

$y(x)=\dfrac{3}{4}e^x+\dfrac{5}{4}e^{-x}.$

Step-by-step explanation: We are given to find the solution of the following initial value problem :

$y^{\prime\prime}-y=0,~~~y(0)=2,~~y^\prime(0)=-\dfrac{1}{2}.$

Let $y=e^{mx}$ be an auxiliary solution of the given differential equation.

Then, we have

$y^\prime=me^{mx},~~~~~y^{\prime\prime}=m^2e^{mx}.$

Substituting these values in the given differential equation, we have

$m^2e^{mx}-e^{mx}=0\\\\\Rightarrow (m^2-1)e^{mx}=0\\\\\Rightarrow m^2-1=0~~~~~~~~~~~~~~~~~~~~~~~~~~[\textup{since }e^{mx}\neq0]\\\\\Rightarrow m^2=1\\\\\Rightarrow m=\pm1.$