exam Maths Puzzle Numerical Ability

i need help solving a three variable equation. the two given equations are x+y+z=81 and .078x+.092y+.117z=30.01. thank you so much!

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exam Other Question

Select the rule to describe the nummber of pounds p(n) as a function of a nukber of tons n. Here are your choices::::::::::::::::::::::::

A.) p(n) = 1600n

B.) p(n) = 2000n hello please i really need help with this problem i try them but i donot know if the right

6. Jerry works no more than 20 hours a week during the school year. He is paid $