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3 years ago

PLEASE PLEASE HELP ME 30 POINTS! x + 20 ≤ -10

Mathematics

2 answers:

Archy [21]3 years ago

8 0

Answer:

x is less than -30

Artemon [7]3 years ago

7 0

X + 20 <= -10

Subtract 20 from both sides:

X <= -30

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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

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3 years ago

If n = -1, which of the following statements is false?

Rainbow [258]

Answer: B

Step-by-step explanation:

Those lines around n mean it’s talking about absolute value. Absolute value is the positive version of any number. This that -1 would turn into 1. If that’s the case, then |n| < 0 would be false

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3 years ago

Can someone show me how to work out this example?<br><br><br> (5+44+182−20−10)÷(2+5)

lora16 [44]

Answer:

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Step-by-step explanation:

(5+44+182-20-10)÷(2+5)

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(261-10)÷÷(7)

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Answer:

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3 years ago

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Answer:

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Step-by-step explanation:

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2 years ago

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