Public debt in example 5 of section 2.3, the federal debt held by the public as a percent of the gross domestic product (gdp) was modeled by the function
y=0.00630t^3-0.289t^2+4.00t+25.3
where t was the time (in years) since 1980. source: budget of the u. s. government.
(a) find the average public debt, as a percent of gdp, from 1990 to 2000.
(b) find the average public debt, as a percent of gdp, from 2000 to 2015.

answer:

bbj

step-by-step explanation:

question 1 is 8, question 2 is 9, question 3 is 24

step-by-step explanation:

now, the numbers they give you at the top are the key. from there, you just have to plug and chug! let's try 1, 2, and 3!

key: a=3, b=5, c=6

1. a+5

remember, a=3, so we plug that in to get 3+5=8

2. 15-c

c=6, so we plug that in to get 15-6=9

3. 4b

b=6, so we plug it in to get 4*6=24

time to try the rest on your own! if you put the answers below in a comment, i'll check them for you!

you can first factor out the n to get n(1+5). we know that 1+5 is 6, so we just have 6n.