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3 years ago

13=2m+5 solve for m?

Mathematics

2 answers:

BlackZzzverrR [31]3 years ago

5 0

Answer:

I believe to answer to m would be 4

Step-by-step explanation:

Given knowing that 2m + 5 is equal to 13, you could always subtract to find m.

13 - 5 = 8

Given 8, we know that any number multiplying by 2 would have the answer of 8. You could divide 8 by 2 to find your missing variable.

8 ÷ 2 = 4

Which leaves you with 4, which means 4 is your missing variable.

m = 4

13 = 2(4) + 5

Vika [28.1K]3 years ago

3 0

Answer:

m=4

This is because you subtract 5 then divide it all by 2

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2. Determine the sum of the first 400 ODD numbers.

il63 [147K]

Odd numbers take the form $2n-1$ , where $n\ge1$ is an integer. When $n=400$ , the last odd number would be 799. So we're adding

$S=1+3+5+\cdots+795+797+799$

By reversing the order of terms, we have

$S=799+797+795+\cdots+5+3+1$

and we can pair up terms in both sums at the same position to write

$2S=(1+799)+(3+797)+(5+795)+\cdots(795+5)+(797+3)+(799+1)$

so that we are basically adding 400 copies of 800, and from there we can find the value of the sum right away:

$2S=400\cdot800\implies S=160,000$

###

We could also make use of the formulas,

$\displaystyle\sum_{i=1}^n1=n$

$\displaystyle\sum_{i=1}^ni=\dfrac{n(n+1)}2$

We have

$S=\displaystyle\sum_{i=1}^{400}(2i-1)=2\sum_{i=1}^{400}i-\sum_{i=1}^{400}1=400(400+1)-400=400^2=160,000$

3 0

4 years ago

Which of the following is CORRECTLY written in scientific notation? Question 1 options: .34 x 10(exponent 3) 34 x 10(exponent 3)

ExtremeBDS [4]

Correct scientific notation has only one number to the left of the decimal point.

The correct one would be: 3.4 x 10(exponent 3)

5 0

3 years ago

5. During the election for class president,

Alex Ar [27]

60 more students voted for Kevin

Step-by-step explanation:

Given

total students = 300

Voted for Jennifer = 40%

Voted for Kevin = 60%

We will find number of students for one of them and then will subtract from total to find the others.

So,

Students who voted for Jennifer:

$= 40\%\ of\ 300\\=0.40*300\\=120\ students$

Students who voted for Kevin

= $=Total\ students-Students\ who\ voted\ for\ Jennifer\\=300-120\\=180\ students$

In order to calculate that how many more students voted for Kevin :

180-120 = 60

Hence,

60 more students voted for Kevin

Keywords: Percentage

Learn more about percentage at:

#LearnwithBrainly

4 0

3 years ago

What is simple interest rate if p=$4000,t=2years,and I=$320

PolarNik [594]

I=PRT
R=percetnt in decimal form
x%=x/100

I=320
T=2
P=4000
320=(4000)(x/100)(2)
320=8000(x/100)
320=80x
divide both sides by 80
4=x
answer is 4%

6 0

4 years ago

Read 2 more answers

What is 2× - 5 > or equal to 9

choli [55]

X > or equal to 7 u switch the signs around if you divide or multiply by a negative

4 0

3 years ago