A jewelry maker incurs costs for a necklace according to C(x)=22x+1600. If the revenue function for the necklaces is R(x)=72x how many necklaces must be sold to break even? Step 1 Select the condition under which the jewelry maker would break even. R(x)=C(x)C(x)=0R(x)=0R(x)=C(x) Substitute in R(x) and C(x). R(x)=C(x)