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Slav-nsk [51]
3 years ago
15

A function is defined by f(x)=5(2-x). What is f(–1)?

Mathematics
1 answer:
liq [111]3 years ago
5 0
In the given function f(x) = 5(2-x), subst. -1 for x, obtaining f(-1) = 5(2-[-1])= 10.
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I've been sitting on this problem for 2 hours! AND I STILL DON'T KNOW WHAT THE HECK IT ISSS!!!!
MArishka [77]

Answer:

A

Step-by-step explanation:

Use foil to expand it.

y = 4 (x^2 + 7x - 9x - 63)     Combine the like terms on the right.

y = 4(x^2 - 2x - 63)              Use the distributive property to remove the brackets.

y = 4x^2 - 8x - 4*63            Combine the two multiplied factors on the right.

y = 4x^2 - 8x - 252              4* 63 = 252

The answer is A

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3 years ago
THIS IS EASY!!! (PLEASE HELP... ILL GIVE BRAINLIST)
rodikova [14]

Answer:

-7(9) < -56

Step-by-step explanation:

-7(9) is -63 which is less than -56 so anything above that is less than 56-

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2 years ago
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An experiment has 12 possible outcomes, all equally likely. An event can occur in 6 ways. Find the probability that the event oc
Nataliya [291]

Probability of an event= number of ways an event can occur / total number of possible outcomes.

Probability = 6/12 = 0.5

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2 years ago
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If the measure of arc CB is 8/3 units, what is the measure of CAB?
Oksanka [162]

Question:

If the measure of arc CB is \frac{8}{3} \pi units, what is the measure of ∠CAB?

Answer:

120°

Step-by-step explanation:

The figure has been attached to this response.

The figure shows a circle centered at A and has a radius of 4 units.

Also, the length of the arc CB (as given in the question) is  \frac{8}{3} \pi units.

The length <em>L </em>of an arc is given by;

L = \frac{\beta }{360} * 2\pi  * r         -----------------(i)

Where;

β = angle subtended by the arc at the center of the circle and measured in degrees

r = radius of the circle

From the question;

β = ∠CAB

r = 4 units

L =  \frac{8}{3} \pi

<em>Substitute these values into equation (i) as follows;</em>

\frac{8}{3} \pi = \frac{\beta }{360} * 2\pi  * 4

=>  \frac{8}{3} \pi = \frac{\beta }{360} * 8\pi

<em>Cancel 8</em>\pi<em> on both sides</em>    

\frac{1}{3} = \frac{\beta }{360}

<em>Cross multiply</em>

3 x β = 360 x 1

3β = 360

<em>Divide both sides by 3</em>

<em />\frac{3\beta }{3} = \frac{360}{3}<em />

β = 120°

Therefore, the measure of ∠CAB is 120°

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3 years ago
Simplify the expression. <br><br> Did I do this right ??
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