Answer:
Step-by-step explanation:
#1
x-7>10
x>10 + 7
x>17
#2
3x <= 21
x <= 21/3
x<= 7
#3
5a - 2<18
5a < 18 + 2
5a <20
a <20/5
a<4
#4
2t + 8 >= -4(t +1)
2t +8>= -4t -4
2t + 4t >= -4 - 8
6t >= -12
t>= -12/6
t>= -2
42
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-1/4
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