If $x=\{{{n}^{2}}+1:\text{ }n\text{ is a positive and }1\le n\le 5\}$

$y=\{5n:n\text{ is a positive integer and }1\le n\le 5\}$

find $x\cap y$

Simplify $\frac{5+\sqrt{7}}{3+\sqrt{7}}$

If ${{\log }_{10}}2=0.3010\text{ and }{{\log }_{10}}7=0.8451$ evaluate ${{\log }_{10}}280$

Solve ${{5}^{2(x-1)}}\times {{5}^{x+1}}=0.04$

A student spent $\tfrac{1}{5}$of his allowance on books, $\tfrac{1}{3}$of the reminder on food and kept the rest for contingencies. What fraction was kept.

A man brought a second – hand photocopy machine for N34,000. He serviced it at a cost of N2,000 and sold it a profit of 15%. What was the selling price?

Evaluate $\frac{81.81+99.44}{20.09+36.16}$

Simplify $7\tfrac{1}{12}-4\tfrac{3}{4}+2\tfrac{1}{2}$

If 55_x +52_x =77₁₀, find x

Subtract 16418₉ from 18630₉