Help last assignment pls.

Mathematics

1 answer:

KatRina [158]3 years ago

3 0

So we have the equation 13 = d ÷ 6. To find d, reverse the equation by using multiplication. (13 × 6 = d)

Multiply 13 by 6.

13 × 6 = 78

Now plug the product into the original equation to check.

78 ÷ 6 = 13

<h2>Answer:</h2>

d = 78

I hope this helps!

if you need help with anything else in this category let me know :)

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The function f(x) = –x2 + 20x – 75 models the profit from one customer, in dollars, a shop makes for printing photos, where x is

trasher [3.6K]

The function is graphed as shown below

Part A:

We use the formula $- \frac{b}{2a}$ to find the vertex of the function. A quadratic function of the form of $a x^{2} +bx+c$ and equating this form to the given function $- x^{2} +20x-75$ , we have
$b=20$ and $a=-1$ .

Substituting $a$ and $b$ into the vertex formula, we have
$x=- \frac{20}{2(-1)}=10$ , as shown in the graph

This calculation means that the highest profit is achieved when the number of photo printed equals to ten photos

Part B:

We can find solution to this equation by factorising

$- x^{2} +20x-75=0$
$-( x^{2} -20x+75)=0$
$x^{2} -20x+75=0$
$(x-5)(x-15)=0$
$x=5$ and $x=15$ , as shown in the graph

The two values means that the company makes no profit when they either produce 5 or 15 photos