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yan [13]
3 years ago
5

The number of hours a group of 12 children in Mrs. Smith's kindergarten class read in a day.

Mathematics
1 answer:
sergey [27]3 years ago
5 0
Anwser: 30min no more
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Evaluate the expression, using the given value of the variable.
Bond [772]
4-2x+5x=\ \ \ \ | grouping\ numbers\\\\
4+3x\ \ \ \ | substitute\ x=4\\\\
4+3*4=4+12=16\\\\
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8 0
3 years ago
A quantity b varies jointly with c and d and inversely with eWhen b is 18, c is 4, d is 9, and e is 6What is the constant of var
777dan777 [17]

Answer:

constant of variation = 3

Step-by-step explanation:

we know that b varies jointly with c and d

so:

b∝c∝d

and b varies inversely with e, so

b∝\frac{1}{e}

and i will call the constant of variation k, this way we can make an equation for b in the following form:

b=k\frac{cd}{e}

this satisfy that b varies jointly with c and d (if b increases, c and d also increase) and inversely with e (if b increases, e decreases)

we know that when b is 18, c is 4, d is 9, and e is 6:

b=18\\c=4\\d=9\\e=6

substituting this in our equation for b:

b=k\frac{cd}{e}\\ 18=k\frac{(4)(9)}{6}

and we solve operations and clear for the constant of variation k:

18=k\frac{36}{6}\\ 18=6k\\\frac{18}{6}=k\\ 3=k

the constant of variation is 3.

4 0
3 years ago
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The sum of x and 5 is 12. What is the value of x? Enter your answer in the box as a fraction in simplest form. x =
larisa [96]

This might help it has tons of different problems for your subject.


https://www.wyzant.com/resources/lessons/math/algebra/calculators/proportion

5 0
3 years ago
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Mrs. drennan keeps a bag of small prizes to distribute to her students. She likes to keep at least three times as many prizes in
Ber [7]
26x3=78
78-x=72
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She needs to buy at least 6 more to have enough for 26 students

8 0
3 years ago
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I need 5-10 please i really need help getting my grade up
irina [24]
5. D
6.G
7.B
8.J
9.C
10.F
Sorry it took time.

3 0
3 years ago
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