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3 years ago

BRAINLIEST BRAINLIEST!!! EASY MATH! Do with explanation!!

Mathematics

1 answer:

Anuta_ua [19.1K]3 years ago

3 0

Answer:

Answer is given below with explanations.,

Step-by-step explanation:

$1)formula \: for \: linear \: equation \: is \: \\ ax + by + c = 0 \\ 2) \: solution \: of \: the \: equation \: y = 9x - 3 \\ (2,15) \: is \: the \: solution \: \\ on \: substitutuing \: the \: points \\ 15 = 9(2) - 3 \\ 15 = 18 - 3 \\ 15 = 15 \\ hence \: proved\\ 3) \: given \:( k,7) \: is \: a \: solution\\ \: of \: y = - 4x + 1 \\ on \: substitutuing \: the \: points \\ 7 = - 4k + 1 \\ 4k = - 7 + 1 \\ 4k = - 6 \\ k = \frac{ - 6}{4} \\ k = \frac{ - 2}{3}$

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A test preparation claims that more than 50% of the students who take their test prep course improve their scores by at least 1

satela [25.4K]

Answer:

Step-by-step explanation:

Corresponding scores before and after taking the course form matched pairs.

The data for the test are the differences between the scores before and after taking the course.

μd = scores before taking the course minus scores before taking the course.

a) For the null hypothesis

H0: μd ≥ 0

For the alternative hypothesis

H1: μd < 0

b) We would assume a significance level of 0.05. The P-value from the test is 0.65. The p value is high. It increases the possibility of accepting the null hypothesis.

Since alpha, 0.05 < than the p value, 0.65, then we would fail to reject the null hypothesis. Therefore, it does not provide enough evidence that scores after the course are greater than the scores before the course.

c) The mean difference for the sample scores is greater than or equal to zero

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3 years ago

To cover a rectangular region of her yard, Penny needs at least 155 square feet of sod. The length of the

Tasya [4]

To cover a rectangular region of her yard, Penny needs at least 170.5 square feet of sod. The length of the region is 15.5 feet. What are the possible widths of the region?

L=length=15.5 ft; W=width; A=area=>170.5 sq ft

L*W=>170.5 sq ft Divide each side by L

W=>170.5 sq ft/L

W=>170.5 sq ft/15.5 ft=>11 feet

ANSWER: To cover at least 170.5 sq ft. the width must be at least 11 feet.

<h2>Brainly pls</h2>

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3 years ago

Find the volume of a pyramid with a square base, where the perimeter of the base is 8.2\text{ cm}8.2 cm and the height of the py

7nadin3 [17]

Answer:

$V=18.2cm^3$

Step-by-step explanation:

The volume of the pyramid is given by:

$V=\frac{A_{b}h}{3}$

where $A_{b}$ is the area of the base and $h$ is the height.

We know that the height is:

$h=13cm$

Thus we need to find the area of the square at the base.

The perimeter of the square is:

$p=8.2cm$

this means that the length of the sides of the square is :

$l=\frac{p}{4}\\ \\l=\frac{8.2cm}{4}\\ \\l=2.05cm$

Now we can find the area of the base which the area of the square:

$A_{b}=l^2\\A_b=(2.05cm)^2\\A_b=4.2025cm^2$

and finally we find the volume:

$V=\frac{A_{b}h}{3}$

$V=\frac{(4.2025cm^2)(13cm)}{3}\\ \\V=\frac{54.6325cm^3}{3}\\ \\V=18.2108cm^3$

Which rounded to the nearest tenth of a cubic centimeter is: $V=18.2cm^3$

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3 years ago

Jun Wei is a bus driver who earns $ 1600 per month while Lixin is a manager who earns $ 6800 per

gulaghasi [49]

Answer:

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2 years ago

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baherus [9]

13/21 were sold on the two days

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3 years ago