Daniel expanded the expression as shown.
-2(-8x-4y+3/4=-10x-8y-1 1/4
a. what errors did he make? check all that apply.
b. the first term should be positive.
c. the second term should be positive.
d. he did not distribute the -2 properly.
e. he added -8 and -2 instead of multiplying -8 by -2.
f. he did not simplify the expression completely.
g. the last term should be -1 1/2, not -1 1/4.

practice. practice. practice.

v = 1/3 a^2h

step-by-step explanation:

the volume is 1/3 a^2h.

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