The third equation is linear
KL + LM = KM
2x + 5x = 7
7x = 7
x = 7/7
x = 1
KL = 2x......2(1) = 2
LM = 5x.....5(1) = 5 <====
Inclusive means including 1 and 80
ok so we know that 1^2=1 so 1 is a perfect square
just go up and square them untill 80 and the results is your answers
2^2=4, 4 is another
3^3=9
4^2=16
5^2=25
6^2=36
7^2=49
8^2=64
9^2=81 which is over
so the perfect squares from 1 to 80 are
1,4,9,16,25,36,49,64
Step-by-step explanation:
22x13, 10x9, then both answers from the previous equations multiplied. Any questions?
1200.27671875 hope it helps!