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astraxan [27]
3 years ago
15

Which will result in a difference of squares?

Mathematics
1 answer:
Vedmedyk [2.9K]3 years ago
8 0
Please show the choices
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In an arithmetic series, what is the sum of the first 22 terms if the first term is 12 and the common difference is 3?
Vilka [71]

Answer:

561

Step-by-step explanation:

an = dn - (a-d)

The difference is 3.

The first term is 12.

an = 3n - (12-3)

an = 3n - 9

Put n as 1, 2, 3, 4, 5 ....22.

3(1) - 9 = -6

3(2) - 9 = -3

3(3) - 9 = 0

3(4) - 9 = 3

3(5) - 9 = 6

...

3(22) - 9 = 57

Add the first 22 terms.

-6+-3+0+3+6+9+12+15+18+21+24+27+30+33+36+39+42+45+48+51+54+57

= 561

4 0
3 years ago
Pls help I’m failing math I’ll brainlest for the right answer grades close today
tatyana61 [14]

answer: i think that it would increase by about 20 percent

i am not sure, if i m wrong then i am very sorry!

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Help!!!
DochEvi [55]
I think it’s b so yea
6 0
2 years ago
An employee worked 36 hours last week. This week, she worked 48 hours. Find the percent increase. Round to the nearest percent.
ioda

Answer:

There was a 25% increase.

Step-by-step explanation:

6 0
3 years ago
Yolanda is making a banner for a school pep rally. She cuts fabric in the shape of a parallelogram. The angle at the bottom-left
Roman55 [17]

Answer: x=100

Step-by-step explanation:

In parallelograms the opposite angles are equal. As the bottom left angle is 80° the opposite angle (top right), is also 80°. All 4 angles in a quadrilateral must add up to 360. Because you know 2 angles added together are 160° the other two angles must equal 200°. As opposite angles are equal you know 2x=200, divide by 2 x=100

8 0
3 years ago
Read 2 more answers
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