Answer:
8x-2
Step-by-step explanation:
perimeter=2l+2w
perimeter= 2(2x+3)+2(2x-4)
=4x+6+4x-8
=8x-2
It has to be -912 because i checked on a caculator
30:60:90 is 3:6:9 in ratio form
<span>A(n) = 50 x (0.52)n-1; 13.52 cm
</span>
Let the first brother = x
second brother = x + 2
third brother = x + 4
<span>The product of the first and third boys' ages is 20 more than twice the second boy's age:
x(x+4) = 2(x+2) + 20
x</span>² + 4x = 2x + 4 + 20
x² + 4x - 2x - 24 = 0
x² + 2x - 24 = 0
(x - 4)(x + 6) = 0
x = 4 or -6 (rejected, age cannot be negative)
First brother = 4
Second brother = 4 + 2 = 6
Third brother = 4 + 4 = 8
The three boys are 4, 6, and 8 years old.
