H=255-21t-16t^2

PLEASE HELP!!

Which of these people has balanced their checkbook correctly? oa. gary: the balance in his check register is $500 and the balance in his bank statement is $500. b. gail: the balance in her check register is $400 and the balance in her bank statement is $500. c. gavin: the balance in his check register is $500 and the balance in his bank statement is $510.

Which shows one way to determine the factors of 4x3 + x2 – 8x – 2 by grouping?

Which of the following shows the length of the third side, in inches, of the triangle below