Amy bought 3 pounds of lemons at $2 per pound, a box of rice for $4, and 7 frozen dinners for $3 each. what is the change in the amount of money she has

$31

Step-by-step explanation:

Given: Amy bought 3 pounds of lemons at $2 per pound, a box of rice for $4, and 7 frozen dinners for $3 each.

Then the total cost of lemons

The total cost of frozen dinners=

the total amount she spent=

Thus, she spent total $31 , it implies the change in the amount of money she has= $31

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

the radius is 2 times the diameter.

step-by-step explanation: