4days ago, emily blew up a balloon (that is a perfect sphere) to a radius of 5 cm5\text{ cm}5 cm. since then, the balloon has lost air and decreased by 0.5 cm0.5\text{ cm}0.5 cm each day.
what is the ratio of the current volume of the balloon to the volume of the balloon 444 days ago?
27125\dfrac{27}{125}125
27
(choice b)
b
925\dfrac9{25}25
9
(choice c)
c
13\dfrac133
1
(choice d)
d
35\dfrac355
3

Step-by-step explanation:

Since, the radius of the balloon 4 days ago = 5,

⇒  

Now, if the radius is decreased by 0.5 cm each day,

Then the current radius of the balloon = 5 - 4 × 0.5 = 5 - 2 = 3 cm,

⇒  

Thus, the ratio of the current volume of the balloon to the volume of the balloon 4 days ago

⇒ Option A is correct.

my guess would be b and d, but i didn’t actually get out the pen and paper. lol

yes

step-by-step explanation:

so of course you want to start by plugging the 5 in which goes to 7(5)+3(5)=50 because 7*5=35 and 3*5=15 and then add them together, then plug in the 5 to the other equation as well 9(5)+5=50 because 9*5= 45 and then add 5 and so yes they are equivalent.