Sam put 2,000 in a savings account at his bank. after 10 years, his account balance was 4,000. the interest rate on the savings deposit is blank percent

The formula is

A=p (1+r)^t

A future value 4000

P present value 2000

R interest rate?

T time 10 years

4000=2000 (1+r)^10

Solve for r

4000/2000=(1+r)^10

(4000/2000)^(1/10)=1+r

R=(4,000÷2,000)^(1÷10)−1

R=0.07177×100

R=7.177%

c.

step-by-step explanation:

d. bc = 12 and ef = 16

step-by-step explanation:

we are given that δabc : δdef such that .

also, it is given that

so, from the options, we need that .

a.

b.

c.  

d.

as, we can see that only option d gives the same ratio as i.e. .

hence, the possible lengths are bc = 12 and ef = 16.