Answer:
3.
m + 7 ≥ 20
Subtract 7 on both sides,
m ≥ 20 - 7
m ≥ 13
The answer is m ≥ 13.
( you need to include both > and =, that is ≥ )
4.
2.1x = 23.1
Divide 2.1 on both sides,
x = 23.1 / 2.1
x = 11
Set up a proportion.
x 5
- = -
5.6 4
4x = 5(5.6)
4x = 28
4x 28
- = -
4 4
x = 7.
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Answer:

Step-by-step explanation:
Using the rule of exponents
⇔
, then
=
= 
Answer:
Only the 2nd and 5th options are correct.