exam Maths Puzzle Numerical Ability

Simplify the followin: 4(2a-b)-3(a-2b)

This is what I have: 5a+2b is this right?

Thanks, Lackinmath

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exam Other Question

the mass of an object varies jointly within its density and its volume. If 156 grams of iron has a volume of 20 cm^3 and a density of 7.8 gm/cm^3, what is the volume of 312 grams of iron with the same density?

Answer:(blank)cu.cm. Hi, Can anyone help with this word problem? The height h in feet of an object after t seconds is given by the function h = -16t2 + 20t + 5. How long will it take the object to hit the ground? Round your answer to the nearest thousandth.