Question

The value of a photo is given by the equation v=-0.85t + 4.2, where v is the value and t is the time in years from the date of purchase. In which year will the photo have no value?
A. 3 years
B. 4 years
C. 5 years
D. 6 years

Answer 1

v= O
find t ?

Answer 2

I divide each year by t?

Answer 3

v=-0.85t+4.2
when v = 0

You need to find t?

Answer 4

I don't get you

Answer 5

Okay
U need to find the value of t for which v =0 using the equation given, do you get that part

Answer 6

Okay so v is not going to equal -0.85

Answer 7

v=-0.85t+4.2
when v =0
0 = -.85t+4.2
subtract 4.2 from both sides
0-4.2 = -8.5t +0
-4.2 = -8.5t
Could you solve now

Answer 8

I get two as my answer

Answer 9

yes that right :)

Answer 10

But two is not one of my answer choices

Answer 11

sorry my bad theres a mistak
v=-0.85t+4.2
when v =0
0 = -.85t+4.2
subtract 4.2 from both sides
0-4.2 = -0.85t +0
-4.2 = -0.85t
Could you solve now

Answer 12

That's what I did and I go two o.O

Answer 13

check it again:) your calculation is wrong

Answer 14

It's 3

Answer 15

\[t =\frac{4.2}{0.85}\]

Use a calculator

Answer 16

My answer is not one of my answer choices. And I'm doing just what you told me to do

Answer 17

4.2 /0.85 = 4.94 which is rounded to 5 years :)

Answer 18

Thankyou c: