Let r1,…,rp be vectors in Rn, and let Q be an m×n matrix. Write the matrix [Qr1⋯Qrp] as a product of two matrices (neither of which is an identity matrix).

answer: d. $20

step-by-step explanation:

just took the test

step-by-step :

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

about 0.75 hours

step-by-step explanation: