In ΔPQR, r = 870 cm, p = 410 cm and ∠Q=142°. Find ∠R, to the nearest degree.

Which best explains why this triangle is or is not a right triangle?

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

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 (%)