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11Alexandr11 [23.1K]

4 years ago

12

A student needs to collect exactly 20 insects for a science project. The student has already collected 13 insects. Write an equa

tion that can be used to find n, the number of insects the student still needs.
A. 13n = 20
B. n - 13 = 20
C. n + 13 = 20
D. 20 + 13 = n

1 answer:

sergeinik [125]4 years ago

8 0

Answer:

The answer is c: N + 13 = 20

Step-by-step explanation:

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RoseWind [281]

Answer:

4) A

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Step-by-step explanation:

#4

$\frac{x}{y}=\frac{1}{10} * \frac{z}{y}$

$\frac{x}{y} =\frac{1z}{10y}$

Cross multiply the equation and you get:

$10xy=zy$

Since $\frac{a}{b}=\frac{c}{d}$ is the same thing as $ad=bc$ , you can change the equation into $\frac{x}{z} =\frac{y}{10y}$

Cancel out the y on the top and bottom and you get 1/10

#5

$\frac{2}{3} *\frac{x}{2} =5$ , simplify and you get $\frac{x}{3} =5$ so x=15

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7 0

3 years ago

a tree 20 feet tall with a circumference of 3 ft has a vine wound around 7 times. How long is the vine?

FinnZ [79.3K]

If the tree is 20 feet tall with circumference 3 feet then the length of vince is around 21 feet.

Given the height of tree is 20 feet and the circumference of tree is 3 feet.

We have to find the length of vine.

Circumference is the perimeter of a circular object. Because the trunk of a tree is in shape of circle so the perimeter of the trunk is 2πr.

We have been given the circumference of tree be 3 feet.

Circumference=2πr

Because vine is 7 times the circumference so the length of vine being:

Length of vine=7*3

=21 feet.

Hence if the tree is 20 feet tall with circumference 3 feet then the vince is around 21 feet long.

Learn more about circumference at brainly.com/question/20489969

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4 0

2 years ago

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Step-by-step explanation:

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3 years ago

You estimate that a baby pig weighs 20 pounds. The actual weight of the baby pig is 16 pounds. Find the percent of error

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Answer:

U were 20% off

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Step-by-step explanation:

16/20 is 80%

100%-80% is 20%

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4 years ago

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Rama09 [41]

Answer:

70, 130

Step-by-step explanation:

Just took the Mastery test on PLATO and this answer was correct.

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3 years ago