Someone me with this. i will up-vote

match each equation with the number that makes it true.
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18 + s = 33
27 = 9 · s
40 - s = 23
5 · m = 35
18/s = 3
m/5= 10
m + 14 = 18 - m
m + m + 12 = 22
n + 7 = 18
n - 9 = 22
11
31
7
50
15
17
3
6
5
2

Ageologist had two rocks on a scale that weighed 4.6 kilograms together.rock a was 0.5 of the total weight.how much did rock a weigh?

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters