Step-by-step explanation:
90+60+7x+12=180(sim of angles in a triangle)
7x+162=180
7x=180-162
7x=18
x=18/7
x=2.6
a cheeta is the fastes animal
3x+21-12=8x-28
collect the like terms
3x-8x=-28(21-12=9)
-5x=-28-9
-5x=-37
x=7.4
Answer:
the first one is right, the second is less than or equal to (the second to last sign) and the last one is greater than or equal to( the last sign)
Step-by-step explanation: