Question 112633
Hello!


Since {{{A=(b1+b2)/2*h}}} that means that {{{224=(20+x)/2*16}}} (I just subtitute)


If {{{224=(20+x)/2*16}}}
= {{{448=(20+x)16}}} (I just multiplied 2 to both sides)
={{{448=320+16x}}} (I just distribute 16)
={{{128=16x}}} ( I just subtracted 320 to both sides)
={{{8=x}}} ( I just divide 16 to both sides)


Since x is the 2nd base that means that 8 is the 2nd base.
The answer is 8m.

If you have any questions I'm more than happy to help you!