exam Maths Puzzle Numerical Ability

Amelia chose 3 CDs that each cost $16. The sales tax on the three CDs is $3.96. Write a direct variation equation relating sales tax to the price. Graph the equation you wrote in.

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exam Other Question

factor:
4x(squared)-49y(squared)

factor:
4x(squared)-28x+49

simplify the rational expression
1
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1 + 1
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r x Trying to help my son logically solve following problem (rather than using guess and check):
(t^2) + m = 28
t + (m^2) = 148

Solve for t and m.

Thanks