Question

Please help

Find the value of x. Round the answer to the nearest tenth, if needed.

A.9
B.18.9
C.22
D.32.1

Answer 1

`\Delta ADC\sim\Delta CDB\\\\therefore\\\\(21)/(x)=(x)/(49)\ \ \ \ |cross\ multiply\\\\x\cdot x=21\cdot49\\\\x^2=21\cdot49\to x=√(21\cdot49)\\\\x=7√(21)\to x\approx32.1`

Answer: D. 32.1

Answer 2

its D              does your work need to be shown?