Using a(x)=x(48-x) find the following: a. a(10) b. a(20) c. a(28) d. a(x)=0

  A(x) = x(-x + 48)
  A(x) = x(-x) - x(48)
  A(x) = -x² - 48x
A(10) = -(10)² - 48(10)
A(10) = -100 - 480
A(10) = -580

  A(x) = x(-x + 48)
  A(x) = x(-x) - x(48)
  A(x) = -x² - 48x
A(20) = -(20)² - 48(20)
A(20) = -400 - 960
A(20) = -1360

  A(x) = x(-x + 48)
  A(x) = x(-x) - x(48)
  A(x) = -x² - 48x
A(28) = -(28)² - 48(28)
A(28) = -784 - 1344
A(28) = -2128

A(x) = x(-x + 48)
A(x) = x(-x) - x(48)
A(x) = -x² - 48x
A(0) = -(0)² - 48(0)
A(0) = 0 - 0
A(0) = 0
 

At a constant it will take one hour to travel 32 mi.at that speed it will take 1/2 hr to travel the remaining 16 mi.it will take 1+1/2 hr to travel the 48mi @ 32mph.so 1 hr = 60 min& 1/2 hr = 30 min1+1/2 hr = 90 min.there are 60s in each 90 × 60 = 3600 seconds.the real question seriously is he why are they driving so slow? ! lol.