exam Maths Puzzle Numerical Ability

you have at least $30 in change in your drawer, consisting of dimes and quarters. write and inequality that shows the different number of coins in yur drawer. Can some one please help me with this?

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exam Other Question

Factor the polynomial completely by factoring out any common factors and then factor by grouping. Do not combine like terms.

3a to the 3rd power + 3ab squared + 2a squared b + 2b to the 3rd power
In a set of 200 numbers, how many will lie within 2 standard deviations of the mean?