for 147 i felt like a genius because i got an answer. but its probably wrong. I did a proportion of 10/4 to 10-h/x then i cross multiplied. divided by x and that would be my radius. then i pluged that into the formula for areas of circles so my answer was pie(40-h/10) squared =a.
but do not listen to me.
For 151 my answers do not match the book either. whoevers question this is feel free to call me if you can not understand my crazy logic that is most likely wrong:)
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