Question

A football star earns a $12 million annual salary in 2010. In 2015, he will earn $14,500,000. What is the rate of change of his salary per year?

$500,000 per year

$1,000,000 per year

-$500,000 per year

-$1,000,000 per year
A cell phone company offers text message plans where the number of texts allowed varies directly with the amount of money paid. Their most popular plan is 400 texts for $8. How many text messages are included in the plan that costs $10?

500 texts

600 texts


700 texts

800 texts

http://prntscr.com/8t8r33
http://prntscr.com/8t8r5r

Answer 1

5,000,000

Answer 2

for the cellphone one, you can set up a proportion \(\dfrac{400}{$8}=\dfrac{x}{$10}\)

Answer 3

=500

Answer 4

yup

Answer 5

On the football player, the change in salary over 5 years is 2,500,000. Divide by 5 to get the rate of change per year. 2500000/5= ?

Sorry, I had one too many zeros in this.

So, not 5, 000, 000 but what?

Answer 6

What should this be > 5,000,000

Answer 7

500,000

Answer 8

Yes, that is what I got.

Answer 9

Two problems left for those viewing :) ^^

Answer 10

any ideas on them?

Answer 11

I'm guessing for the 1st screenshot, it would be -1/2

Answer 12

yeah i got that too

Answer 13

Alrighty, I'm just taking a look at the 2nd one

Answer 14

And I think it would be the 1st option

Answer 15

Because when you plug in 1 for x in the equation, y=-2

Answer 16

And the slope is 3 as well :)

Answer 17

You know how to identify the slope, right? The coefficient of x is always the slope.

Answer 18

so it would be a?

Answer 19

Yep :)

Answer 20

ok ty cx

Answer 21

No problemo =D

Answer 22

You know how to identify the slope, right? The coefficient of x is always the slope.

Answer 23

And the slope is 3 as well :)