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3 years ago

Please help!

Mathematics

1 answer:

julsineya [31]3 years ago

7 0

Answer:

A trend line is a straight line that best represents the points on a scatterplot. The trend line may go through some points but need not go through them all. The trend line is used to show the pattern of the data. This trend line may show a positive trend or a negative trend.

Step-by-step explanation:

answer above

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Please help! explain the answer please

klemol [59]

Answer:

a) area of sidewalk: 346.5 ft²

b) 278 bags

Step-by-step explanation:

The formula for the area of a circle is ...

A = π·r² . . . . . where A is the area and r is the radius of the circle. (The radius is half the diameter.)

There are a couple of ways to find the area of a "washer" (a circle with a hole in the middle). One is to subtract the area of the hole from the area of the larger circle. Another way is to find the circumference of the circle whose radius is the average of the inner and outer radii, and multiply that by the width of the washer (the difference of the outer and inner radii).

For the latter purpose, the formula for the circumference of a circle is ...

C = π·d . . . . . or, since the diameter is twice the radius, ...

C = 2π·r

___

a) Here, the diameter of the circle that is the center of the walkway is ...

28 ft + 3.5 ft = 31.5 ft

So, the circumference of that circle is ...

C = π·d = (22/7)·(31.5 ft) = 99 ft

Then the area of the walkway is ...

(99 ft)·(3.5 ft) = 346.5 ft²

b) 0.8 bags of concrete are required for each square foot, so we can find the number of bags by multiplying 0.8 times the number of square feet:

bags = 0.8 × 346.5 = 277.2

If only whole bags are available, then 278 bags of concrete will be the minimum number needed.

_____

<em>Comment on the two methods of doing this calculation</em>

If r1 and r2 are the inner and outer radii of the circles, then the area of the washer is π(r2² -r1²).

The centerline diameter will be (2r2 +2r1)/2 = r1 +r2, and the width of the washer will be (r2 -r1). Then the washer area will be π·(r1 +r2)·(r2 -r1). This latter expression can be "simplified" to π(r2² -r1²), a formula for the washer area that is identical to the one above.

6 0

3 years ago

Line segment xy has endpoints at x(2, -3) and y(-1, 2). what is the length of xy

Assoli18 [71]

The length of xy = $\sqrt{ (-1-2)^{2} + (2+3)^{2} } = \sqrt{ (-3)^{2} + 5^{2} } = \sqrt{9+25} = \sqrt{34} ;$

4 0

4 years ago

1. Chicken stock cost $6.80 per gallon.

vredina [299]

1. 13.6 6.80 3.60...

7 0

4 years ago

Read 2 more answers

50 POINTS!!!

e-lub [12.9K]

10 oz of salmon is needed for 16 servings

20 oz of salmon is needed for 32 servings

50 oz of salmon needed for 80 servings

62.5 oz of salmon needed for 100 servings

<em><u>Solution:</u></em>

Given that,

One roll can be cut into 8 servings

The ingredients for one roll include sushi rice, seaweed sheets, cucumbers, cream cheese, and 5oz of smoked salmon

1 roll is 8 servings and it is made of 5 oz of smoked salmon

Which means that, 5 oz of smoked salmon is needed fo 8 servings

Write an expression for the amount of salmon needed to make s serving of sushi

$Amount\ of\ salmon = \frac{5}{8}s$

Where, s = serving

<h3><u>How much salmon is needed to make ?</u></h3><h3><u>16 servings</u></h3>

$Amount\ of\ salmon = \frac{5}{8} \times 16 = 5 \times 2 = 10$

Thus 10 oz of salmon is needed for 16 servings

<h3><u>32 servings</u></h3>

$Amount\ of\ salmon = \frac{5}{8} \times 32 = 5 \times 4 = 20\ oz$

Thus 20 oz of salmon is needed for 32 servings

<h3><u>80 servings</u></h3>

$Amount\ of\ salmon = \frac{5}{8} \times 80 = 5 \times 10 = 50\ oz$

Thus 50 oz of salmon needed for 80 servings

<h3><u>100 servings</u></h3>

$Amount\ of\ salmon = \frac{5}{8} \times 100 = 5 \times 12.5 = 62.5\ oz$

Thus 62.5 oz of salmon needed for 100 servings

4 0

3 years ago

Amar tried to evaluate an expression step by step. -2 + 5 - (-3)

Zanzabum

Answer:

Step-by-step explanation: - (-3) should be a positive 3 when simplified. Whenever there is two negative sign in front of a number it is going to be positive.

6 0

3 years ago