(5x+3)(-5x+6) box method to distribute and simplify

Terri makes a quilt using three sizes of fabric squares the side lenght of each fabric square is the square root of the area

If your teacher tells you to do questions 6 through 19 in your math book for homework, how many questions is that

Maria found the least common multiple of 6 and 15. her work is shown below. multiples of 6: 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, . . multiples of 15: 15, 30, 45, 60, . . the least common multiple is 60. what is maria's error?