5p+9c=p solve for c i am confused on how to do it

Find the area of a trapezoid with a height of 23, base 1 of 10 and base 2 of 18

The actual length of side t is 0.045 cm. use the scale drawing to find the actual side length of w. a) 0.06 cm b) 0.075 cm c) 0.45 cm d) 0.75 cm

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'