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SVETLANKA909090 [29]
3 years ago
6

There are 149 people in Jared’s class. Jared buys erasers for each of them. Erasers are sold 4 to a pack. How many packages of e

rasers does Jared need to buy?
Mathematics
2 answers:
kaheart [24]3 years ago
8 0

Answer:

38 packages of erasers

Step-by-step explanation:

Divide 149 by 4 to determine the amount of packs

this is gives you 37.25, but you can't have a 0.25 of a package

therefore you would need 38 to compensate that 0.25 of a package

Oduvanchick [21]3 years ago
6 0
Approximately 37 packs should do
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Answer:

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Step-by-step explanation:

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6 0
3 years ago
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If you answered 37 problems correctly on a 42 question test, what percent would you recieve
OleMash [197]
The fraction would be 37 out of 42. You basically divide the two and get something around 88%.
5 0
3 years ago
You have two parents, four grandparents, eight greatgrandparents, and so forth.
Leviafan [203]
A.
In the first generation we have 2 ancestors.
In the second generation we have 4 ancestors or 2^{2} ancestors.
In the third generation we have 8 ancestors ot 2^{3} ancestors.

We can see that each succesive generation has two times more members. The sum is:
2+4+8+16+...+ 2^{40}

To calculate number of ancestors we can use formula <span>for the sum of a geometric sequence. Geometric sequence is sequence of numbers that differ by a certain factor. This factor is called ratio. Formula is:
</span>S= a_{1} * \frac{1- r^{n} }{1-r}
<span>Where:
S -> sum
a1 -> first member of a sequence
r -> ratio
n -> number of elements

For this question:
a1 = 2
r = 2
n = 40
</span>S= 2* \frac{1- 2^{40} }{1-2} =2 199 023 255 550
<span>
b.
1 generation = 25 years
40 generations = 40 * 25 = 1000 years

c.
Total number of people who have ever lived = </span>10^{10}
Number of ancestors in 40 generations = 2.2*10^{12}

The number of ancestors is greater than total number of people who have ever lived. This means that not all ancestors were distinct and that in each generation both men and women had children with more than one partner.
8 0
3 years ago
Which of the following ratios has the same ratio value as 4:6?
Strike441 [17]

Answer:

6:9

Step-by-step explanation:

the answer is 6:9 because 4:6' equivalent is 2:3, which is the same as 6:9

8 0
3 years ago
(10) Both red line and blue line trains left the station at 5:00 pm. If both
scoundrel [369]

Answer:

5:40

Step-by-step explanation:

This is a problem involving the least common difference.

If you know that the red and blue trains left at the same time at 5, you know that another red train will leave at 5:08. Another blue train at 5:10.

The way to solve this will be to write out the factors of 8 and 10 and find the smallest number that they overlap.

Red:

8, 16, 24, 32, 40, 48, 56, 64, 72, 80

Blue:

10, 20, 30, 40

You see that after 40 mnutes, they are both leaving the station again. After 40 minutes, at 5:40, they are both leaving.

6 0
3 years ago
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