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3 years ago

15

Which of the following is a factor of x2 - 6x – 27? (1 point) O x + 3 O x + 9 O x-1 O None of the above

2 answers:

Greeley [361]3 years ago

8 0

Answer:

(x+3) is a factor of your question

Step-by-step explanation:

x²-6x-27

x²+3x-9x-27

x(x+3)-9(x+3)

(x+3)(x-9)

Nikolay [14]3 years ago

8 0

Answer:

Hope it can help you and please mark me as a brainlist .....

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At a rock concert, the ratio of girls to boys is 3:7. If there are 360 more boys than girls, how many girls are at the concert?

bixtya [17]

You could understand the ration as parts: the total number of parts was 3+7=10.

So girls were 3/10 parts and boys 7/10 parts. The difference was 7-3=4 parts. this difference is equal to 360, so each part is 90 (4*90 =360).

so girls are "3 parts" and each part is 90, then the number of girls is 3*90=270.

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3 years ago

The radius of a cylinder is doubled and its height is halved. Find the ratios of their surface areas.

Inessa [10]

Answer: 1:1

Step-by-step explanation:

Let r be the radius and h be the height of a cylinder.

Formula: Curved surface area of cylinder = $2\pi rh$

Now, if radius of a cylinder is doubled and its height is halved, then new radius will be R= 2r and new height will be $H=\dfrac{1}{2}$

Now, new surface area = $2\pi RH= 2\pi(2r)\dfrac{h}{2}= 2\pi rh$

Ratio of curved surface areas : $\dfrac{\text{Surface area}}{\text{New surface area}}=\dfrac{2\pi rh}{2\pi rh}=\dfrac{1}{1}$

Hence, the ratios of their surface areas = 1:1 .

5 0

3 years ago

Please please help me!!!

Dafna1 [17]

Answer is 40. A triangle equals 180 so all you do is subtract 65 and 75 from 180 to get your answer.

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3 years ago

Which of the following is equivalent to<br> (5) 3<br> O 54<br> O 54<br> 05<br> O V5

IrinaK [193]

Answer:

D. $\sqrt[3]{5^7}$

Step-by-step explanation:

The formula for this conversion is:

$a^\frac{x}{n}=\sqrt[n]{a^x}$

Substitute the values you currently have.

$5^\frac{7}{3}=\sqrt[n]{a^x}$

Since we know that

a = 5

x = 7

n = 3

Fill the square root with this.

$5^\frac{7}{3}=\sqrt[3]{5^7}$

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2 years ago

Tina has been dieting for a total of 13 weeks she lost 3 pounds on the first week of her dad but gain back a pound on the second

natima [27]

So Tina has been dieting for 13 weeks

On week 1: She lost 3 pounds, so +3 pounds

On week 2: She gained a pound, so - 1 pound

On each remaining week, she lost 2 pounds, so,

On week 3: She lost 2 pounds, so +2 pounds

On week 4: She lost 2 pounds, so +2 pounds

On week 5: She lost 2 pounds, so +2 pounds

On week 6: She lost 2 pounds, so +2 pounds

And so on,,,

So losing 2 pounds each week for 11 weeks would equal, 2 pounds x 11 weeks = 22 pounds

So, add that all up: 3 pounds - 1 pound + (2 x 11 weeks) = 24 pounds total

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3 years ago