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3 years ago

HELP ME PLEASE I NEED TO FINISH THIS SOON

Mathematics

2 answers:

Grace [21]3 years ago

8 0

Answer:

Step-by-step explanation:

X=15

natta225 [31]3 years ago

4 0

Answer:

x=15

Step-by-step explanation:

Since the whole thing is a straight angle, the inside angles are going to have to add up to 180, and we already know their is a 90 degree angle inside of it so:

180-90=90

We have 90 left. Since the last to angles are like-terms, we can add them:

5x+x=90

Add x:

6x=90

Divide by 6:

x=15

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△ABC is mapped to △A′B′C′ using each of the given rules.

juin [17]

Answer:

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Step-by-step explanation:

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3 0

3 years ago

In a recent study of statistics students, a random sample of students were asked to provide the number of hours per week they sp

Airida [17]

Answer:

$ME=\frac{Upper-Lower}{2}= \frac{8.15-6.55}{2}= 0.80$

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

$\bar X$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

s represent the sample standard deviation

n represent the sample size

Solution to the problem

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

For this case the confidence interval is given by (6.55,8.15). And we can estimate the margin of error with this formula since the confidence interval is symmetrical:

$ME=\frac{Upper-Lower}{2}= \frac{8.15-6.55}{2}= 0.80$

3 0

3 years ago

1. 2 ⅜ x 3 3/7

notsponge [240]

Answer:

34.33 (rounded to 2 decimal points)

Step-by-step explanation:

all sides are equal to 3.25 so do

3.25 x 3.25 x 3.25 = 34.328

5 0

3 years ago

When 4(0.5x+2.5y-0.7x-1.3y+4) is simplified. What is the resulting expression

Simora [160]

Answer:

A. -0.8+4.8y+16

Step-by-step explanation:

7 0

3 years ago

Evaluate [20x ÷ 5 · (-x)] + 3

Anna35 [415]

Order of operations, the order in which to do them
pemdas
parenthasees
exponents
multiplication or division (whichever comes first)
addition or subtraction (whichever comes first)
so

inside parenthaees first
20x/5=4x

now we has
[4x*(-x)]+3
multiply
4x*-x=-4x²

now we has
[-4x²]+3
-4x²+3 is the eavlauted form

8 0

4 years ago