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3 years ago

I'm literally the worst at math. here's my problem: 10 (2y+2) - y = = 2(8y-8)

Mathematics

2 answers:

Trava [24]3 years ago

6 0

The answer is y = 12

kipiarov [429]3 years ago

3 0

Hope this helped pls give me the brainliest :))

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1~ A quick. rough estimate of the time required for money to double can be obtained by dividing which ofthe following numbers by

dem82 [27]

Answer:

B. 72

Step-by-step explanation:

The rule of 72 is used as a rough estimate of the number of years required for an investment to double.

According to this rule, the number of years 'n' necessary to double an investment at an annual rate 'r' is:

$n=\frac{72}{r}$

Therefore, the number that when divided by the interest rate gives the number of years required to double an investment is 72.

The answer is B. 72.

6 0

3 years ago

How to solve this problem?

valentinak56 [21]

Very nice handwriting but the math and English are confusing.

Let's assume we're told

$\displaystyle 45 = \sum_{i=1}^9 (x_i - 10)^2$

The subscript is important.

I think we're told the similar sum with 11 gives the smallest possible value for the sum. This is a rather cagey way of telling us 11 is the mean of the nine points. The mean is the number which minimizes the sum of squared deviations.

$\displaystyle 45 = \sum_{i=1}^9 (x_i - 10)^2 = \sum x_i^2 - 20 \sum x_i + 9(100)$

$\displaystyle \sum x_i^2= 20 \sum x_i - 900$

If 11 is the mean, the sum of the points is 9(11)=99.

$\displaystyle \sum x_i^2= 20 (99) - 900 = 1080$

Answer: 1080

6 0

3 years ago

Solve by graphing: use any method x + y = 6 x - y = 4

jekas [21]

X+y=6
x-y=4
using these equations we solve for either x or y in one and plug it into that variable in the other equation.
x=y+4 so y+4+y=6 so 2y=2 so y=1
now using y=1 put into first equation. x+1=6 so x=5
so we know our graph goes through the coordinate point (5,1) then just make an x table and use some values to find the corresponding y coordinate and then do that for at least three points or more if needed to find the best fit for graph. Hope this helps walk you through it! Any questions please just ask! Thank you!

4 0

3 years ago

A survey asked 72 randomly chosen students if they were going to attend the school play twelve said yes, predict the number of s

Lilit [14]

72 people questioned , 12 are going . that means that 16.6..% of which are going , 16.6....% is equal to 1/6 so 210 x 6 = 1260 . the number of students that attend the school would be 1260 if im right but if its how many students attended the play then it would be a 1/6 of 210 which is 35

8 0

3 years ago

What is the correct answer... 7x(3+6-2)+x-5

spayn [35]

7x(3+6−2)+x−5

Combine Like Terms:

=49x+x+−5

=(49x+x)+(−5)

=50x+ −5

I hope this helps!

8 0

3 years ago