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SIZIF [17.4K]
2 years ago
7

Which expression is equivalent to x² - 4x - 45?

Mathematics
2 answers:
dolphi86 [110]2 years ago
7 0

Answer:

D

(x - 9)(x+5)

Step-by-step explanation:

x² + 5x - 9x - 45

x · (x + 5) - 9 (x + 5)

(x - 9) (x + 5)

lisabon 2012 [21]2 years ago
6 0

Answer:

D. (x - 9)(x+5)

Step-by-step explanation:

x^{2} - 4x - 45 is your expression, so you have to factor it out. Since from the options available it's clear that the factors of -45 you use are some form of 9 and 5, we can use the process of elimination to figure out which are the correct ones.

First, through FOIL u know that in any factored form the last two terms in each bracket multiply together to make the last term in the expanded form.

So first, look at A. the last two terms are -9 and -5, which = 45 when multiplied together. 45 does not = -45, so it can't be A.

B has 9 and 5. When they're multiplied, they = 45, which does not = -45, so its not B

It can't be C either, because the first term of the first bracket in C is 20, and when multiplied with x it doesn't produce x^2.

Therefore it has to be D. u can check this by multiplying -9 and 5, which = -45, the final term in the expanded form. Also, -9 + 5 = -4, which is the middle term of the expanded form.

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F(x) = 3x+2<br> What is f(5)?
Anni [7]

Answer:

the answer will be 17.

Step-by-step explanation:

if, f (x) = 3x + 2

f (5) = 3 × 5 + 2 = 17.

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2 years ago
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Answer:

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Step-by-step explanation:

8 0
2 years ago
Hershey’s manufactures candy bars in batches of 800. The fixed cost is $20 per batch, with variable cost of $0.10x where x equal
SVETLANKA909090 [29]
The answer to this word problem is letter A. 200.

Here is the solution:
given:
candy bars in batches of 800
fixed cost of $ 20 per batch
variable cost of $ 0.10 x
x= the number of batches

<u>$ 20 ( 800 )</u>  = <u>16, 000</u>
$ 0.10 (800)        80

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3 0
3 years ago
the radius of a cylindrical construction pipe is 3 ft . If the pipe is 25ft long , what is it’s volume ?
ki77a [65]

Given:

radius of a cylindrical construction pipe is 3 ft

lenghtis 25ft long

Required:

what is it’s volume

Explanation:

volume of cylinder:

\begin{gathered} V=\pi r^2h \\  \\ here\text{ h is the length of the pipe} \\  \\ V=3.14\times(3)^2\times25 \\  \\ V=3.14\times9\times25 \\  \\ V=707\text{ ft}^3 \end{gathered}

Required answer:

V=707\text{ ft}^3

7 0
8 months ago
All of them plz I need help if ur older Shouldnt be hard
vfiekz [6]

Answer:

The answer for number 1 would be 57 dollars and 80 cents

Number two would be little ceasars

Number 3 would be 75 dollars and 60 cent

Number 4 would be 40 dollars and 80 cent

Number 5 would be 110 dollars and 98 cents

Step-by-step explanation:

Because of you take 68 and times it by 15% which would be .15 you would get 10.2 you would then take 68 and subtract 10.2 from it and get 57.8

Number 2: take 7.50 times it by .3 and you get 2.25 then subtract 2.25 from 7.50 and you get 5.25 so even with the coupon little ceasars pizza is still 25cent cheaper

Number 3: add 42 to 28 and you get 70. 8% of 70 is 5.6 so add 5.6 to 70 and you have your answer of 75.60

Number 4: 35.48 is the price alone. Times that number by .15 and you get 5.322. Add 35.48 and 5.322 to get 40.802 but for money wise you just need the 40.80

Number 5: 118 one again is the price standing alone but 118 multiplied by .10 is 11.8 so subtract 11.8 from 118 and you get 106.2 but there is still a sales tax. So 106.2 times .045 or 4.5% would be 4.779, add that number to 106.2 and you get 110.979. Now the problem did not say anything about rounding but the 9 would make the 7 an 8 so of you do that you get 110.98.

So to help you in the future when dealing with percentages with discounts and tax’s. if it’s a discount once you times the original number by the percentage you subtract the sum from the original number. As for taxes you do the same process but instead of subtracting you add

5 0
2 years ago
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