It is 10x4x3x2 equals two hundred and forty
Answer:
342
Step-by-step explanation:
x=5
72+72+18(5)+9+18 (5)+9=342
The shapes are similar.
When two figures are similar, the ratios of the lengths of their corresponding sides are equal.
Therefore,

Simplify:

Cross multiply:
42(10+x) = 57x
420 + 42x = 57x
420 = 57x - 42x
420 = 15x
x = (420÷15)
x = 28