Question

In 1995, the life expectancy of males in a certain country was 67.4 years. In 2002, it was 71.2 years. Let E represent the life expectancy in year t and let t represent the numbers of years since 1995.

1. E(t)=
Round to nearest tenth
2. E(13)=
Round to nearest tenth

My answers are: 1)7t+3.8 2)E(13)=84.2

Answer 1

I hate this question from Day 1.
lol.

Answer 2

haha me too

Answer 3

Let me solve.

Answer 4

(0, 67.4)
(7, 71.2)

Two points. now find slope.

Answer 5

Is this a linear function?

Answer 6

Yes.

Answer 7

So t=(0)+67.4 ? I'm confused

Answer 8

Slope = 0.5

therefore,

E(t)= 0.5t + 67.4

Answer 9

Yes you are correct too.

Answer 10

So does E(13)=84.2?

Answer 11

nooo. it will be 73.9

Answer 12

Do we round off?

Answer 13

Yes.

Answer 14

so 74?

Answer 15

Nope. it says nearest tenth. so 73.9

Answer 16

Ok cool beans!

Answer 17

:)