All categories

2 years ago

PLEASE HELP ME (Above)

Mathematics

2 answers:

tigry1 [53]2 years ago

4 0

Te correct answer is 50%

blondinia [14]2 years ago

3 0

Answer:

the answer is 50% hehe :)

You might be interested in

Subtract the fractions and simpilfy the answer 13/15 - 1/5

guajiro [1.7K]

8 0

3 years ago

Read 2 more answers

The surface area of a melting snowball decreases at a rate of3.8cm2/min. Find the rate at which its diameter decreases when the

Scorpion4ik [409]

Answer:

Step-by-step explanation:

This is a pretty basic related rates problem. I'm going to go through this just like I do in class when I'm teaching it to my students.

We see we have a snowball, which is a sphere. We are talking about the surface area of this sphere which has a formula of

$S=4\pi r^2$

In the problem we are given diameter, not radius. What we know about the relationship between a radius and a diameter is that

d = 2r so

$\frac{d}{2}=r$ Now we can have the equation in terms of diameter instead of radius. Rewriting:

$S=4\pi(\frac{d}{2})^2$ which simplifies to

$S=4\pi(\frac{d^2}{4})$ and a bit more to

$S=\pi d^2$ (the 4's cancel out by division). Now that is a simple equation for which we have to find the derivative with respect to time.

$\frac{dS}{dt}=\pi*2d\frac{dD}{dt}$ Now let's look at the problem and see what we are given as far as information.

The rate at which the surface area changes is -3.8, and we are looking for $\frac{dD}{dt}$ , the rate at which the diameter is changing, when the diameter is 13. Filling in:

$-3.8=\pi(2)(13)\frac{dD}{dt}$ and solving for the rate at which the diameter is changing:

$-\frac{3.8}{26\pi}=\frac{dD}{dt}$ and divide to get

$\frac{dD}{dt}=-.459\frac{cm}{min}$ Obviously, the negative means that the diameter is decreasing.

7 0

3 years ago

after working out for just 8 minutes,ron has burned 56 calories. how many minutes must he work out if he wants to burn 392 calor

dangina [55]

Ron would have to work out 56 minutes to burn 392 calories

7 0

2 years ago

Read 2 more answers

Pls help me!! thank you!!

klasskru [66]

Full working out shown from step 1 to last.

follow it and you get 24 square feet as final answer. Good luck in other questions!!!

3 0

2 years ago

Enter the unknown value that makes this statement true: 20% of ? is 40.

elixir [45]

Answer: 20% of 200= 40

Hope this helps

3 0

2 years ago