What is the area of a circle with a radius of 7 cm? (Use 3.14 for
and round to the nearest tenth.)

153.9 cm²

Step-by-step explanation:

7×7=49

49×3.14=153.9

she drove 134 miles

step-by-step explanation:

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