Peter bought 4 toys. the prices for the first 3 tips were $30, $15, and $18. the average price he paid for the 4 toys was $25 per toys. how much did he pay for the 4th toy

Asap will give brainliest and a lot of points

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

To which sets of numbers does -12 belong? choose all answers that are correct. a) natural numbers b) integers c) real numbers d) irrational numbers