exam Maths Puzzle Numerical Ability

can someone help me find the value of the polynomial
-x^2-9x-6
I have
-5^2-9(5)-6
=-25-45-6
=-76

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exam Other Question

A homeowner wishes to insulate her attic with fiberglass insulation to conserve energy. The insulation comes in 40-cm wide rolls that are cut to fit between the rafters in the att Please help me to solve these equations using the elimination method?

0.06x+0.05y=0.07
0.4x-0.3y=1.1

-4.5x+7.5y=6
-x+1.5y=5

17x+21y=1
17x-5y=6

Thank you