Can someone help me in this exercise, it is about functions. Thank you

Mathematics

1 answer:

Gnesinka [82]3 years ago

5 0

Answer:

Since the radius of the balloon increases by 5 cm every second, the amount of time passed in seconds multiplied by 5 will give us the radius at any given point in time

So, f(t) = 5t

Since the surface area of a sphere is 4 $\pi$ (r)^2

We already have the radius of the sphere at any given time from our first equation

SA(t) = 4 $\pi$ (5t)²

Kindly Mark Brainliest, Thanks!

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The width x of your iris decreases from 4 millimeters to 2 millimeters when you enter a dark room. How many times greater is the

inysia [295]

Answer:

The area of the Iris is 4 times greater.

Step-by-step explanation:

Firstly, we have to realize that we cannot solve this problem without knowing the radius of the iris. because from the information given, the radius of the iris could well be the size of the galaxy and contract from width of 4mm to 2mm and we wouldn't know!

The average radius of the iris is 6mm, so we take this value.

Now, initially the width of the iris is 4mm, that means the radius of the pupil is:

$6mm-4mm=2mm$