Question

Help with Algebra 1 math. MEDAL!

Answer 1

Answer key says the answer is D. But I don't know why.

Answer 2

Can you calculate the change in each year?

Answer 3

I think I did.

from 1898-1971
diff in years: 73
diff in cost: 5
5/73 = 0.07

from 1971-1985
diff in years: 14
diff in cost: 8

from 1985-2006
diff in years: 21
diff in cost: 10
10/21 = 0.48

from 2006-2012
diff in years: 6
diff in cost: 11
6/11 = 0.55

Answer 4

sorry from 1971-1985 the average rate when doing 8/14 = 0.57

Answer 5

i don't know why it's not 2 but 4. the work that i have shows that 2 is greater than 4

Answer 6

thats hould be 11/6 for last period not 6/11

Answer 7

In all the others youre doing change in year/change in cost. Thats wrong. Do change in cost/change in year

Answer 8

@FaiqRaees I don't understand.

Answer 9

its obviously D ....
\[\frac{ 11 }{ 6 } = 1.833333\]

Answer 10

required rate = increase in cost / number of years

Answer 11

For each option apply, Change in cost/ change in year

Answer 12

but when i did A, i got something more than that. @rishavraj

Answer 13

and @FaiqRaees and @welshfella wasn't that what i have been doing?

Answer 14

average rate = \[\frac{ changein cost }{ time }\]

Answer 15

@calculusxy for A its 5/73 which is really less

Answer 16

For a you will get 6-1/73 = 0.07 and, no you were actually doing it but you for d you did change in years/change in cost

Answer 17

oh sorry. i confused it for 73/5

Answer 18

A = 5 / 73

you made a mistake in the last period 2006-2012 You calculated 6/11 instead of 11/6

Answer 19

oh okay

Answer 20

thanks for the help :)

Answer 21

No problem