Is there a formula for these kind of questions?

m = 55°

Step-by-step explanation:

The 2 top interior angles of the triangle are adjacent angles on a line, then

180° - 115° = 65°

180° - 120° = 60°

The sum of the 3 angles in a triangle = 180°

Subtract the sum of the 2 angles fro 180° for third angle

third angle = 180° - (65 + 60)° = 180° - 125° = 55°

m is vertically opposite the third angle and congruent to it

m = 55°

answer: bearing in mind that a rectangle has a perimeter of length + length + width + width.

step-by-step explanation:

p = perimeter

l = length

x=width

p = 2l + 2x

p = 2(l+x)     < ==== perimeter of the base of the box.