Rebecca made a mosaic wall using 42 black tiles, 35 blue, and 23 red tiles. What percent of the mosaic wall uses red tiles?

41/17 as a decimal rounded to the nearest hundredth

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?

If the discriminant if a quadratic equation is 4 which statement describes the roots?