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ArbitrLikvidat [17]
3 years ago
9

4) What is the correct unit for the following measurement?

Mathematics
1 answer:
pogonyaev3 years ago
6 0
Meters is the correct answer
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The 7th graders at Lincoln Avenue School were helping to renovate a playground for the kindergartners at a nearby elementary sch
aliina [53]

Answer: The students will need 90 bags of sand to cover the rectangular area under the large swing set.

Step-by-step explanation: First of all the area of the small and large swing sets is given, all measured in feet. The sand under both swing sets was supposed to be 15 inches deep, but was found to be only 12 inches deep. The rectangular area under the small swing set was measured as 9 feet by 12 feet which gives an area measurement of 108 feet squared. In order to fill up this area by an extra depth of 3 inches, the students had to use up 40 bags of sand.

They would need to also fill up the rectangular area under the large swing set by a depth of 3 inches. However, the dimensions are different because the area under the large swing set has its length 1.5 times as long as that of the small swing set and same thing applies to its width, which is also 1.5 times that of the small swing set. This means the dimensions of the large swing set are derived as follows;

Large swing length = 9 * 1.5

Large swing length = 13.5

Large swing width = 12 * 1.5

Large swing width = 18

If the length and width of the rectangular area under the large swing set are now given as L = 13.5 and W = 18, then the area becomes;

Area = L * W

Area = 13.5 * 18

Area = 243 feet squared

We can now apply the ratio of both areas of the different swing sets to determine the correct number of bags of sand needed for the area under the large swing set.

The ratio of both areas is derived as

Ratio = 108 : 243

Ratio = 4 : 9

Let x be the number of bags of sand needed for the area under the large swing set. You now have;

4 : 9 = 40 : x

This can be properly expressed mathematically as,

4/9 = 40/x

By cross multiplication you now have,

4x = 9 * 40

4x = 360

Divide both sides of the equation by 4

x = 90

Therefore, the students will need 90 bags of sand cover the rectangular area under the large swing set.

8 0
3 years ago
Two new devices for testing blood sugar levels have been developed. How do these devices compare? You test blood sugar levels of
Ber [7]

Answer:

The matched pairs t test.

Step-by-step explanation:

You test blood sugar levels of 20 diabetics with both devices and use B. the matched pairs t test.

6 0
3 years ago
What is 0.08 plus 0.3
Softa [21]
0.08 plus 0.3 is 0.38 because the “0.08” is in the tenths place not the single digit place so “0.3” is really 0.30 and then u add the 0.08
7 0
3 years ago
Read 2 more answers
Estimate the percentage: 6,683 of 20,489<br> a. 0.3% c. 3%<br> b. 43.3% d. 33.3% Explain
Eduardwww [97]

Answer: B

Step-by-step explanation: B

6 0
2 years ago
21 is what percent of 30?
ra1l [238]

\frac{21}{30} *100=70

(Divide then multiply by 100 and you get your answer)
- - Answer: 70%
5 0
3 years ago
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