How many solutions does the equation 4(3x+6)=21x+20-9x+4 have?

The sum of two numbers is 12 and their difference is 18 what are the two numbers

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

52 cm radius = diameter = area = circumference = circumfer