What is (10^3) 5 as an equivalent expression

Acompany that manufactures and sells guitars made changes in their product range. from the start they had 20 models. then they reduced the number of models to 15. as a result, the company enjoyed a 10% increase in turnover. - how much did the stock level change? in (%)

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?

What is the value of x in the equation7x+2y=48 when y=3