Find the standard deviation of 2,3,8,10 and 12

A man earns ₦3,500 per month out of which he spends 15% on his children's education. If he spends additional ₦1,950 on food, how much does he have left?

If P is a set of all prime factors of 30 and Q is a set of all factors of 18 less than 10, find P ∩ ∩ Q

Convert 726 to a number in base three

If log3x2 = -8, what is x?

If 27x + 2 ÷ ÷ 9x + 1 = 32x, find x

Simplify (√6+2)2−(√6−2)2

Evaluate 219 21 9 to 3 significant figures

Simply 223×112445