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4 years ago

How do I solve a problem like this? m-4=2m

Mathematics

2 answers:

Leya [2.2K]4 years ago

8 0

$m-4=2m\ \ \ |Subtract\ m\ from\ each\ side\\\\
-4=m\\\\
m=-4\\\\Solution\ is\ m=-4$

stiks02 [169]4 years ago

4 0

m = -4

m-4=2m
-4+m=2m (reorder)
-4 + 1m + -2m = 2m + -2m (added -2m to both sides)
-4+ -1m =0 (added like terms)
-4 +4+ -1m = 0+4 (added 4 to each side)
-1m = 4
m=-4 (divided by -1)

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Joni’s hair is 13 inches long and grows at an average rate of ⅔ in per month. Her friend Kate’s hair is 16 inches long and grows

Gelneren [198K]

<h3>18 months will pass before the two friends have the same hair length</h3>

Solution:

Let "x" be the number of months

Joni’s hair is 13 inches long and grows at an average rate of ⅔ in per month

$Equation : 13 + \frac{2}{3}x ------- eqn\ 1$

Her friend Kate’s hair is 16 inches long and grows at an average rate of ½ in per month

$Equation: 16 + \frac{1}{2}x ----- eqn\ 2$

For two friends to have the same hair length, eqn 1 must be equal to eqn 2

$13 + \frac{2x}{3} = 16 + \frac{x}{2}\\\\\frac{2x}{3} - \frac{x}{2} = 16 - 13\\\\\frac{4x}{6} - \frac{3x}{6} = 3\\\\x = 18$

Thus 18 months will pass before the two friends have the same hair length

5 0

3 years ago

If f(x) = -2x + 7 and g(x) = x^2 – 2, what is (f•g)(3)?

svetlana [45]

Answer:

(f•g)(3) = -7

Step-by-step explanation:

f(x)=-2x + 7

g(x) = x^2 – 2

(f•g)(3) = -2(x² - 2) + 7

(f•g)(3) = -2x² + 4 +7

(f•g)(3) = -2x² + 11

(f•g)(3) = -2(3)² + 11

(f•g)(3) = -2(9) + 11

(f•g)(3) = -18 + 11

(f•g)(3) = -7

5 0

3 years ago

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fiasKO [112]

Answer:

Step-by-step explanation:

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3 years ago

2.4 statistics A clothing store has a certain shirt in 4 sizes: small, medium, large, and extra large. If it has 2 small, 3 medi

nexus9112 [7]

Answer:

360,360

Step-by-step explanation:

This is called a Permutation with repetition, we want to know in how many ways we can arrange a certain ammount of elements (normal permutation), BUT some of those elements are identical.

The formula we use in these cases is:

$\frac{n!}{n1!*n2!*...*ni!}$

where n is the total amount of elements, n1 is the amount of repeated elements of the type 1, n2 is the amount of repeated elements of the type 2, ni is the amount of repeated elements of the type i.

In this particular case we have:

$n=13$ (total amount of shirts)