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Doss [256]
3 years ago
13

At the beginning of the school year, there were three 4th grade classes. Mrs. Smith’s class had 19 children, Mr. Day’s class has

17 children, and Ms. Brown’s class had 20 children. At the end of the year there were still three classes, but 13 children had moved during the year. How many total students were left at the end of the year?
Mathematics
2 answers:
Blababa [14]3 years ago
7 0
43 19+17+20 = 56 - 13 = 43
MAVERICK [17]3 years ago
7 0

The answer is 43!!!

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What is the solution of -8/2y-8=5/y+4 - 7y+8/y^2-16
blsea [12.9K]

Answer:

<h2>y = 8</h2>

Step-by-step explanation:

Domain:\\\\2y-8\neq0\ \wedge\ y+4\neq0\ \wedge\ y^2-16\neq0\\\\2y\neq8\ \wedge\ y\neq-4\ \wedge\ y^2\neq16\\\\y\neq4\ \wedge\ y\neq-4\ \wedge\ y\neq\pm\sqrt{16}\\\\y\neq4\ \wedge\ y\neq-4\ \wedge\ y\neq-4\ \wedge\ y\neq4\\\\\boxed{y\neq-4\ \wedge\ y\neq4}\\\\===========================

\dfrac{-8}{2y-8}=\dfrac{5}{y+4}-\dfrac{7y+8}{y^2-16}\\\\\dfrac{-8}{2(y-4)}=\dfrac{5}{y+4}-\dfrac{7y+8}{y^2-4^2}\qquad\text{use}\ a^2-b^2=(a-b)(a+b)\\\\\dfrac{-8}{2(y-4)}=\dfrac{5}{y+4}-\dfrac{7y+8}{(y-4)(y+4)}\qquad\text{multiply both sides by (-2)}\\\\\dfrac{8}{y-4}=-\dfrac{10}{y+4}+\dfrac{14y+16}{(y-4)(y+4)}\qquad\text{add}\ \dfrac{10}{y+4}\ \text{to both sides}\\\\\dfrac{8}{y-4}+\dfrac{10}{y+4}=\dfrac{14y+16}{(y-4)(y+4)}

\dfrac{8(y+4)}{(y-4)(y+4)}+\dfrac{10(y-4)}{(y-4)(y+4)}=\dfrac{14y+16}{(y-4)(y+4)}\\\\\dfrac{8(y+4)+10(y-4)}{(y-4)(y+4)}=\dfrac{14y+16}{(y-4)(y+4)}\qquad\text{use the distributive property}\\\\\dfrac{8y+32+10y-40}{(y-4)(y+4)}=\dfrac{14y+16}{(y-4)(y+4)}\qquad\text{combine like terms}\\\\\dfrac{(8y+10y)+(32-40)}{(y-4)(y+4)}=\dfrac{14y+16}{(y-4)(y+4)}\\\\\dfrac{18y-8}{(y-4)(y+4)}=\dfrac{14y+16}{(y-4)(y+4)}\iff18y-8=14y+16\\\\18y-8=14y+16\qquad\text{subtract 14y from both sides}

4y-8=16\qquad\text{add 8 to both sides}\\\\4y=24\qquad\text{divide both sides by 4}\\\\y=8\in D

8 0
3 years ago
ANWSER both questions pls for brainly
hjlf

Answer:

40x-24

3b(6c-3a+c)

Step-by-step explanation:

For the first one use distributive property and multiply each term by 8.

For the second one find a common factor which is 3b and divide all terms by that number.

4 0
3 years ago
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maw [93]

Answer:

2 dollars for one can of tuna

Step-by-step explanation:

3 0
2 years ago
a car travels 10 miles in 15 minutes, how many miles will the car travel in 60 minutes at this rate? how many miles will it trav
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Answer:60/15=4

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Step-by-step explanation:

3 0
3 years ago
Form the union for the following sets. E = {1, 2, 3} F = {101, 102, 103, 104} E ∪ F ={1, 2, 3, 101, 102, 103, 104}
Yanka [14]
<span>E = {1, 2, 3}
F = {101, 102, 103, 104}

answer
E ∪ F ={1, 2, 3, 101, 102, 103, 104}</span>
8 0
3 years ago
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