Twice the square of a certain whole number added to 3 times the number makes 90. Find the number. question under word problems to leading quadratic equations

Can someone me with this problem i don't understand i need

Aboard 60 in. long is cut two parts so that the longer piece is 5 times the shorter. what are the length of the two pieces?

Ellie spent $88.79 at the computer stote. she had $44.50 left to buy a cool hat. how much money did she originally have? write and solve an equation to answer the question.