What number could replace b below?

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

1yd 1 ft = 1 1/12 1 1/3 1 1/2 1 1/6

Acertain company's main source of income is a mobile app. the company's annual profit (in millions of dollars) as a function of the app's price (in dollars) is modeled by p(x)=-2(x-3)(x-11)p(x)=−2(x−3)(x−11) which app prices will result in \$0$0 annual profit? enter the lower price first.