Answer:
option A and B

and

Step-by-step explanation:
we have

The formula to solve a quadratic equation of the form
is equal to

in this problem we have

so

substitute in the formula


so

and

Answer:
r ≤ -1
Step-by-step explanation:
Given in the question
<h3>
3r+2(12r+7) ≤ 5r-8</h3><h3>
It can be solve by Simplifying and Reordering the terms</h3>
3r + 2(12r) + 2(7) ≤ 5r - 8
3r + 24r + 14 ≤ 5r - 8
27r + 14 ≤ 5r - 8
27r - 5r +14 + 8 ≤ 0
22r + 22 ≤ 0
22r ≤ -22
Move term containing r to the left, all term to the right.
r ≤ -22/22
simplifying
r ≤ -1
all negative integers which are smaller than or equal to -1
Nice? ...........................
I dont have a calculator, but 1000(1 plus .145)^12..... I guess
23.4 units is the answer for this one