You have to do whats in the parentheses from left to right then subtract the answer you get by 20
(9x10) - (30+30)
90 - 60 = 30
8 x (12+5) -7^2
17
17-49
18 x -32
= -576.
You have to use pemdas for your check off
P=parentheses
E=exponet
M=multiplication
D=division
A=add
S=subtrabt
HOPE IM CORRECT
The coefficient is 4
The constants are 2 and 3
Answer:

Step-by-step explanation:
well, by using definition of tan of an angle
let the distance between Earth and shooting star is
.
since
,
then 
Answer: There are 1 6/8
Step-by-step explanation:
1 7/8 - 1/8= 1 6/8
Answer:
50
Step-by-step explanation:
all your doing is dividing 100 by 20 and u get 50