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2 years ago

if 40% of the students in the class are boys , and if there are 18 girls in the class , then how many students are in the class?

1 answer:

5 0

30

60% were girls so you put this as a ratio

60/100= 18/x

You calculate x to determine the total number which would equal 30.

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What is 620 divided by 11

harkovskaia [24]

Using a calculator I got 56.36

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3 years ago

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Find the GCF 0f 12 and 18

melisa1 [442]

Answer:

Step-by-step explanation:

Using Euclid's algorithm, we divide the larger by the smaller. If the remainder is zero, the divisor is the GCF. Otherwise, we replace the larger with the remainder and repeat.

18 ÷ 12 = 1 r 6

12 ÷ 6 = 2 r 0 . . . . the GCF is 6

You can also factor the numbers and see what the common factors are.

18 = 2·3·3

12 = 2·2·3

The common factors are 2·3 = 6.

In the factorizations, we see 2 to powers of 1 and 2, and we see 3 to powers of 1 and 2. The GCF is the product of the common factors to their lowest powers: (2^1)(3^1) = (2)(3) = 6

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1 year ago

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Alex777 [14]

Answer:

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3 years ago

-2/7 - (-4/3) -1/3 what is the answer

seraphim [82]

You have to first make like terms

$-\frac{2}{7} -(- \frac{4}{3})- \frac{1}{3} 
$
**you want the denominator to be 21

$\frac{-6+28-7}{21} = \frac{15}{21}= \frac{5}{7}$

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3 years ago

How to find slope within two sets of points

EastWind [94]

The slope within two sets of points is calculated using the slope equation $m = \frac{y_2 -y_1}{x_2 -x_1}$

<h3>What is slope?</h3>

The slope of a line or points is the rate of change of the line.

This in other words means that, the vertical change per unit horizontal change

Assume that the points are given as:

(x1, y1) and (x2, y2)

The slope (m) of the points is:

$m = \frac{y_2 -y_1}{x_2 -x_1}$

Hence, the equation of two sets of points is $m = \frac{y_2 -y_1}{x_2 -x_1}$