exam Maths Puzzle Numerical Ability

Simplify and write without negative exponents.

5y^5(-6y^-7)

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exam Other Question

Bob needs to buy 5 pounds of candy. one kind costs 1.75 per pound and the second kind costs 2.35 per pound. How much of each will he need if he spends 10.00? Rewrite each equation as a function of x
-3x+4y=11

thanks in advance for the help
Heather