exam Maths Puzzle Numerical Ability

supose you need to use at least $1.00 worth of stamps to mail a package. you have as many $0.3 stamps as you need but only four $0.32 stamps.
a. write a system of inequalities tha

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exam Other Question

Find the axis of symmetry:
y = x^2 - x + 10

I can not seem to understand this method, I did look back at some other ones, but felt it confused me even more, help please, thank you!!!
Soybean meal is 12% protein, cornmeal is 6% protein. How many pounds of each should be mixed together in order to get a 240 lb mixture that is 9% protein?