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3 years ago

What would the answer be for this equation 7x/20 - 5x/12

Mathematics

1 answer:

hodyreva [135]3 years ago

4 0

Answer:

$\frac{1}{15} x$

Step-by-step explanation:

$\frac{7x}{20} - \frac{5x}{12}$

$\frac{3 \times 7x}{3 \times 20} - \frac{5 \times 5x}{5 \times 12}$

$\frac{21x}{60} - \frac{25x}{60}$

$\frac{21x - 25x}{60} = (21 - 25)x = - 4x$

$\frac{ - 4x}{60} = - \frac{ x}{15}$

$\boxed{\green{= \frac{1}{15} x}}$

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What are numbers that when multiplied, is 6, and when added is 13?

Radda [10]

Xy=6
x+y=13

x+y=13
minus x
y=13-x
sub for y in other equation
x(13-x)=6
13x-x^2=6
add -13x+x^2 to both sides
0=x^2-13x+6
use quadratic formula
for
ax^2+bx+c=0
x= $\frac{-b+/- \sqrt{b^{2}-4ac} }{2a}$

a=1
b=-13
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x= $\frac{13+/- \sqrt{169-24} }{2}$
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4 years ago

Rich’s weekly salary is based on the number of pairs of shoes he sells. He is paid a base salary of $25, plus $5 for every pair

Xelga [282]

Answer: option A is the correct answer.

Step-by-step explanation:

s represents the number of pairs of shoes that Rich's sells.

P represents the total pay from selling s pairs of shoes.

He is paid a base salary of $25, plus $5 for every pairs of shoes he sells.

The relationship between his pay and pairs of shoes sold can be represented by the linear equation which is expressed as

p = 25 + 5s

For a week in which he sold 7 pairs of shoes, his total pay would be

p = 25 + 5 × 7

p = 25 + 35

p = $60

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3 years ago

Find the slope of the line through each pair of points (-12,-17),(-2,11)

I am Lyosha [343]

The slope is 2.8

Happy studying!

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4 years ago

The ratio between the number of children (c) on a field trip and number of teachers (t) on the trips is 14/3. There are 70 child

Mrrafil [7]

For this case we have a relationship of the form:
$c / t = 14/3
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Therefore, we must replace the value of c = 70 in the equation.
We have then:
$70 / t = 14/3
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Clearing t, we have:
$t = (3/14) * (70)

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Answer:
there are 15 teachers on the trip

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