Find the greatest number of x+y when x^2+y^2 = 7, x^3+y^3=10

Planning for the possibility that your home might get struck by lighting and catch on fire is part of a plan

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers

We just started the introduction into circles and i have no idea how to do this.