3 years ago

Find S25 for (-7) + (-2) + 3 + 8 +...

1 answer:

3 0

$a_1=-7 \\ a_2=-2 \\ \\ d=a_2-a_1=-2-(-7)=5 \\ \\ \\ S_{25}= \cfrac{2(-7)+(25-1)5}{2}\cdot25 = \cfrac{-14+120}{2}\cdot25 =\cfrac{106}{2}\cdot25 =1325$

Your answer is B. 1325

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7/13 of the population of a town is female.of the males 2/3 are married,What fraction population consists of unmarried men?

Mariana [72]

Answer:

Step-by-step explanation:

$\frac{7}{13}$ -Female

$\frac{2}{3}$ - Men Married.

$\frac{7}{13} divided by \frac{2}{3} = \frac{7}{13} x\frac{3}{2} = \frac{21}{6} = 3\frac{2}{6} = 3\frac{1}{3}$

Hope this helps :)

3 0

3 years ago

One number is 5 times a first number. A third number is 100 more than the first number. If the sum of the three numbers is 779,

AlladinOne [14]

Answer:

Step-by-step explanation:

x - the first number

One number is 5 times a first number:

5x - "one" number (the second number)

A third number is 100 more than the first number:

x + 100 - the third number

x + 5x + x+100 - the sum of the three numbers

x + 5x + x+100 = 779

-100 -100

7x = 679

÷7 ÷7

x = 97

5x = 5•97 = 485

x+100 = 97 + 100 = 197

Check:

97 + 485 + 197 = 779

7 0

3 years ago

What is the value of y in the system of equations shown below?

vlabodo [156]

just multiple the numbers.
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3 years ago

Plssss help me with 5 plsssss im giving out brainliest<33333

Natasha2012 [34]

First Row:- 6

Second Row:- 1,3

Third Row:- 4,5,2

Sum of third Row:- 4+5+2=11

7 0

2 years ago

Read 2 more answers

Distribute and simplify: 7(2x-4) + 2(3x+1)

SSSSS [86.1K]

7(2x - 4) + 2(3x + 1) Distribute/multiply 7 into (2x - 4), and multiply 2 into (3x + 1)

14x - 28 + 6x + 2 Combine like terms

20x - 26

Your answer is B

$4y^{2} -\frac{2x}{7} +2y$

x = 7

y = 2

Plug in the numbers into the variables

$4(2)^{2} -\frac{2(7)}{7} +2(2)$

4(4) - 2 + 4

16 + 2

Your answer is D

8 0

3 years ago