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sveta [45]
3 years ago
12

Calculate the new area using a scale factor of 3.

Mathematics
1 answer:
Ludmilka [50]3 years ago
8 0

Answer:

315

Step-by-step explanation:

Using a scale factor of 3 basically means just multiply the length and the width by 3.

So instead of 5 * 7, we are doing 15 * 21.

15 * 21 = 315

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On a certain IQ test, eleven people averaged a 101.5. A certain reality TV star took
dem82 [27]

Answer:

59.98

Step-by-step explanation:

To find the average of a set of numbers, we sum them all together and divide them by the size of the set. Here, we start out with 11 IQ scores. We don't know what they are, but we can still set up an equation with the information we do have. Let's call the sum of those 11 score <em>s</em>. The average must be s/11, which we know is 101.5. With that, we can set up and solve and equation for <em>s</em>:

\dfrac{s}{11}=101.5\\s=101.5(11)\\s=1116.5

Let's call the score of the reality TV star <em>r</em>. If we add their score to the set, we now have <em>12</em> scores. The sum of those scores is gonna be the sum of the previous scores, 1116.5, plus the reality TV star's score, r. To find the average, we divide the sum by 12. Finally, we're told that this average is exactly 98.04. Putting all of this into an equation gives us

\dfrac{1116.5+r}{12}=98.04

We can now solve for r algebraically, first by multiplying both sides by 12:

1116.5+r=98.04(12)\\1116.5+r=1176.48

And then subtracting 1116.5 from both sides:

r=1176.48-1116.5\\r=59.98

6 0
3 years ago
A caterer charger $120 to carter a party for 15 people and $200 for 25 people
Luba_88 [7]

Answer:

y = 8x

Step-by-step explanation:

When the number of people increased by 10, the caterer charged an additional $80. Therefore, we estimate that the cost per person is $8. In order to verify:

$8/person * 15 people = $120. True. $8/person * 25 people = $200. True.

Therefore, if we let x represent the number of people being cater for and y represent the cost, the equation to model the situation is simply y = 8x.

hope it helps!

5 0
2 years ago
Imagine that city officials in your hometown expect a huge rise in population over the next few years. Which of the following pe
ioda

Answer:

C an urban planner

Step-by-step explanation:

8 0
3 years ago
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810 songs; 130% increase
erma4kov [3.2K]
The answer would be 1,053
4 0
3 years ago
Today Cenisa runs 450 meters more than yesterday. Yesterday she ran 1.23 kilometers. How many meters does Cenisa run today?
aalyn [17]

Answer: it’s 1680 meters, i did this question today.

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
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