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3 years ago

Can someone help me with this

Mathematics

2 answers:

lozanna [386]3 years ago

7 0

Answer:

the answer is 2.5 which in not greater than 6 but less than 5

Step-by-step explanation:

kaheart [24]3 years ago

7 0

Answer:

2.5

Step-by-step explanation:

Okay so, if we do the math 5 x 1/2 we get 2.5 right? Once we get 2.5 is that bigger or smaller. That would be smaller! So no the answer is not greater than 6, it is less than 5!

Hope this helps!

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3 years ago

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

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3 years ago

What is the substitution of -6x-8y=-20 and x+6y=-6

ale4655 [162]

Substitution doesn't work for this, but elimination does.

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-6x-8y=-20 + 6x+36y=-36

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28y=-56

divide by 28 on both sides.

Y= -2

Then substitute y into one of the equations.

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Answer:

Step-by-step explanation:

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