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aleksandr82 [10.1K]
2 years ago
14

Help help help ....................

Mathematics
1 answer:
vazorg [7]2 years ago
5 0

Answer:

77

Step-by-step explanation:

There are 415 third graders and 338 second grades the question is asking how many more third graders are there than second graders, so its asking for the difference between them:

415 - 338 = 77

There are 77 more third graders than second graders

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(1/2a - 2/3b) ( 3/5a + 2/3b) multiply the following ​
11111nata11111 [884]

Answer:

Step-by-step explanation:

(\dfrac{1}{2}a-\dfrac{2}{3}b)(\dfrac{3}{5}a+\dfrac{2}{3}b)=\dfrac{1}{2}a*(\dfrac{3}{5}a+\dfrac{2}{3}b) - \dfrac{2}{3}b*(\dfrac{3}{5}a+\dfrac{2}{3}b) \\\\\\= \dfrac{1}{2}a*\dfrac{3}{5}a  + (\dfrac{1}{2}a*\dfrac{2}{3}b) - \dfrac{2}{3}b*\dfrac{3}{5}a- \dfrac{2}{3}b*\dfrac{2}{3}b\\\\\\=\dfrac{3}{10}a^{2} + \dfrac{1}{3}ab - \dfrac{2}{5}ab -\dfrac{4}{9}b^{2}\\\\=\dfrac{3}{10}a^{2} +\dfrac{1*5}{3*5}ab-\dfrac{2*3}{5*3}-\dfrac{4}{9}b^{2}\\\\\\

=\dfrac{3}{10}a^{2}+\dfrac{5}{15}ab-\dfrac{6}{15}ab -\dfrac{4}{9}b^{2}\\\\=\dfrac{3}{10}a^{2}-\dfrac{1}{15}-\dfrac{4}{9}b^{2}

8 0
2 years ago
If you can mow 90 lawns in 45 hours, how long will it take to mow 12?
Alex777 [14]
<h3>Answer:  6 hours</h3>

Work Shown:

(90 lawns)/(45 hours) = (12 lawns)/(x hours)

90/45 = 12/x

2 = 12/x

2x = 12

x = 12/2

x = 6

It takes 6 hours to mow 12 lawns.

5 0
1 year ago
Which mathematical symbol would best fill in the blank to compare the two real numbers?
Vikki [24]

Answer:

squareroot of 7 < 14/5

Step-by-step explanation:

We are given that two real numbers

squareroot of 7 and 14/5

We have to compare the given two real numbers and  fill the mathematical symbol in the blank

In order to compare the given real number we will find the value of given real numbers .

Value of squareroot of 7 = 2.646

Value of 14/5 = 2.8

Value of 2.645 is less than 2.8.

Hence,  squareroot of 7 is less than 14/5

hope i helped! :D

-strawbxrrywine on IG

5 0
2 years ago
Svp aidez moi jai pas compris cet exercice
Andrej [43]

Answer:

Svp aidez moi jai pas compris cet exercice

Step-by-step explanation:

4 0
2 years ago
Someone help me asap please.
zaharov [31]

15. x ≤ -24

    x + 19 ≤ -5

    x ≤ -24

16. z > -12

    3z > -36

    z > -12

17. 185 + c > 410; c > 225


18.   C.

    x - 6 ≥ 1

    x ≥ 7

7 0
3 years ago
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