Is a triangle with the sides of length 6 ft, 21ft, 23ft a right triangle?

Really need on these. i have no idea what to do

Find the balance at the end of 4 years if 1000 is deposited at the rate of

Use the expression below.–4b + 8c + 12 – 8b – 2c + 6part asimplify the expression. enter your answers in the boxes. b + c + part bfactor the simplified expression using the gcf. a. 2(–2b + c + 3) b. 3(–2b + c + 3) c. 4(–2b + c + 3) d. 6(–2b + c + 3)part cwhat is the value of the expression when b = 2 and c = –3? enter your answer in the box.