Annie needs to change the price of a pile of sweaters. She is told to apply a discount function on each price, d(p)=.85p d
(
p
)
=
.85
p
, and then increase the resulting price: r(p)=p+10
r
(
p
)
=
p
+
10
.

What is the function that Annie can use to calculate both price changes?

f(p)=0.85p+(p+10)
f of p is equal to 0 point 8 5 p plus open paren p plus 10 close paren

r(d(p))=0.85p+10
r times open paren d times p close paren is equal to 0 point 8 5 p plus 10

f(p)=0.85p⋅(p+10)
f of p is equal to 0 point 8 5 p times open paren p plus 10 close paren

d(r(p))=0.85p+8.50
d times open paren r times p close paren is equal to 0 point 8 5 p plus 8 point 5 0