exam Maths Puzzle Numerical Ability

Solve using sustitution method,answer presented as an ordered pair.
8x-24y=16
5x-10y=-5

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exam Other Question

How many quarts of a pure solution must be added to a 5% solution to get 4 quarts of a 14.5% solution?
Find equation(s) and solve.
Not out of text book! f(x)=(e^x+e^-x)divided by 2. or f(x)=(e^x+e^-x)/2. There is a graph below the equation that you have to fill in. the X is filled in for u. you have to find
f(x)... im stuck on