<h2><u><em>IT's b ksfjasfamafdsj</em></u></h2>
<span>let x be the interval, then:
186 = 50 + 3 + (3+x) + (3+2x) + (3+3x) + (3+4x) + (3+5x) + (3+6x) + (3+7x)
186 = 74 + 28x
x = 4
Eldest son age = 3+7x = 3+28 = 31.</span>
Answer:#9- Answer: -7
#10- Answer: 0
#11- Answer: 4
#12- Answer: -4
Step-by-step explanation:
The increase percentage is 50 percent because the new value is greater than the old value.
