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slavikrds [6]
3 years ago
12

Last year there were 1,435 8th graders at a school. This year there are 1,220. What is the percent change in the number of 8th g

raders
Mathematics
1 answer:
nikdorinn [45]3 years ago
3 0
Hello! So to solve this question, we can write and solve a proportion. We write the proportion as change/original = x/100, where change is the distance between two number and the original is the previous number. Percents are parts of 100, so x is a percentage out of 100%. 1,435 - 1,220 is 215. Now, set it up like this.

215/1,435 = x/100

Cross multiply the values to get 21,500 = 1,435x. Divide each side by 1,435 to isolate the "x". 21,500/1,435 is 14.9825783972 or 15 when rounded to the nearest whole number. The percent change in the number of 8th graders is about 15%.
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The number of ways to choose the colors is 36

<h3>How to determine the number of ways?</h3>

The given parameters are:

Colors = 9

Colors to choose = 7

Since order does not matter, then it is combination

This is calculated using:

^nC_r = \frac{n!}{(n - r)!r!}

This gives

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Evaluate

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6 0
1 year ago
A coin has two sides head and tails a die has six sides if you roll the die what is the probability that you flip heads and roll
weqwewe [10]

Using it's concept, the probability that you flip heads and roll a number greater than 5 is: \frac{1}{12}.

<h3>What is a probability?</h3>

A probability is given by the <u>number of desired outcomes divided by the number of total outcomes</u>.

In this problem, we have that:

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Hence the probability of both events is:

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7 0
2 years ago
NEED HELP PLEASE
postnew [5]

Answer:

It goes over the goal post by 6 feet

Step-by-step explanation:

The football will be at the same x position as the goal when x = 40. When x = 40, y = -0.03 * 40² + 1.6 * 40 = 16. The height of the goal post can be represented by the equation y = 10. Since 16 > 10, the football goes over the goal post by 16 - 10 = 6 feet.

3 0
3 years ago
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RSB [31]

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6.2y can be combined with -3/8y

7 0
3 years ago
What is the value of the expression below when x<br> 10 and y = 9?<br> 9x + 9y
Tasya [4]

Answer:

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Step-by-step explanation:

9x + 9y

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171

Best of Luck!

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3 years ago
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