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tensa zangetsu [6.8K]
3 years ago
11

What is

title=" \frac{x}{7} = \frac{4}{5} " alt=" \frac{x}{7} = \frac{4}{5} " align="absmiddle" class="latex-formula">
Mathematics
1 answer:
frosja888 [35]3 years ago
7 0

Multply both sides of the equation by 7.

\dfrac{x}{7}\cdot 7=\dfrac{4}{5}\cdot 7\\\\x=\dfrac{28}{5}=5.6

_____

When the variable is in the numerator of a proportion like this, you can solve it by multiplying by that denominator. That multiplication cancels the denominator and gives you the value of the variable.

In general, you multiply by the reciprocal of the coefficient of x. When that coefficient is 1/7, you multiply by 7/1. Of course, you know that 7/7 = 1 and that x/1 = x.

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5 0
2 years ago
Solve -1/3w -3/5 = 1/5w
Dmitrij [34]

Answer:

w= -9/8

Step-by-step explanation:

-1/3w -3/5 = 1/5w

+1/3w            +1/3 w

-3/5=1/5w+1/3w

Make common denominators to combine like terms of the right

-3/5=1/5w+1/3w

         *3       *5

-3/5=3/15w+5/15w

-3/5=8/15w

multiply both sides by the reciprocal of 8/15 which is 15/8

-3/5*15/8=8/15w*15/8

\frac{-3}{5}*\frac{15}{8} ----> cross reduce 5 in the denominator becomes 1 and 15 in the numerator becomes 3

\frac{-3}{1}*\frac{3}{8} -----> now multiply across

w= -9/8

7 0
3 years ago
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How do I use Negative and Zero Exponents
andrew-mc [135]
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8 0
3 years ago
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A building has an entry the shape of a parabolic arch 22 ft high and 28 ft wide at the base, as shown below.
Ivenika [448]
The parabola is at Max of 22
5 0
2 years ago
andre rode his bike at a constant speed he rode 1 mile in 5 minutes which of these equations represents the amount of time in mi
Alex777 [14]

We are given

Andre rode his bike at a constant speed he rode 1 mile in 5 minutes

Firstly, we will find constant speed

In 5 minutes , distance travelled =1 miles

so, we get speed

v=\frac{1}{5} mile/min

Let's assume T is time in minutes

D is the distance in miles

we  know that

Time=\frac{Distance}{speed}

so, we can plug value

and we get

T=\frac{D}{\frac{1}{5}  }

so, we get

T=5D...............Answer

3 0
2 years ago
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