Answer:
b c e
Step-by-step explanation:
Assuming compount interest format

for compounded per 1 year
A=future amount
P=present amount
r=rate in decimal
t=time in years
given
P=270
r=5%=0.05
the equaton is

or

for any year, 2009, is year 0, so if you wanted to input the year then

would be for t=what year it was
A.

b. 2009 to 2020
2020-2009=11 years
t=11

f(11)=461.792
about 462 cranes
A.

B. about 462
Answer:
Oc. x>11
Step-by-step explanation:
Subtract 4 from 4 which will give you 0, then subtract 4 from 15 which should give you 11. x is still greater than 11. You don't switch the signs unless you're dividing or multiplying by a negative number. Hope this helps.
Answer:
x ≥ 12.5
Step-by-step explanation:
2(x-9) ≥ 17---Use Distributive Property
2x-18 ≥ 17
2x-18+18 ≥ 17+18
2x ≥ 25
2x/2 ≥ 25/2
x ≥ 12.5
I hope this helps!