6. Tony is going to buy a new bike. The bike costs $120.50. If Tony uses a 25% coupon how much will he pay for the bike after using the coupon? (10 pts)

$90.38

Step-by-step explanation:

25% of $120.50 is $30.125

$120.50 - $30.125 = $90.375 rounded to $90.38

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204