Crystal said she used the distributive property to evaluate 5(4 + 7). These are the steps she took: 5(4 + 7) = 5⋅4 + 7 = 20 + 7 = 27
What mistake did Crystal make? What is the correct answer to 5(4 + 7)?
Type a paragraph

She didnt distribute the 5 to both the 4 And the 7; answer is 55

Step-by-step explanation: She only distributed it to the 4 and added the 7

answer: 457.14

step-by-step explanation:

205 - 45 = 160

160 / .35 = 457.142857

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