Please Help I’ll give brainlist for correct answer Evaluate the expression

If p = 1, r=-7, and s= -2
-3p-21 6+4s

A. -5 1/2
B. -11/3
C. 11/14
D. 4 1/2

7x+8y=-18, 4x-9y=-3 solve the system of equations

Compare these two waves: the blue and orange waves have the same pitch, but the blue wave is louder. the blue and orange waves have the same volume, but the blue wave has a higher pitch. the orange wave has a higher pitch, but the blue wave is louder. the blue wave has a higher pitch, but the orange wave is louder.

Aplane flies around trip to philadelphia it flies to philadelphia at 220 miles per hour and back home with a tailwind at 280 miles per hour if the total trip takes 6.5 hours how many miles does the plane fly round trip