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timama [110]
3 years ago
15

What number when substituted for the variable, makes the equation 4/5x = 20 true?

Mathematics
2 answers:
Galina-37 [17]3 years ago
8 0
25
but im bad sooooooooo
ivolga24 [154]3 years ago
3 0
Sent a picture of the solution to the problem (s).

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Factor completely:<br>64 - y^3
madam [21]
From your equation, you can see that you have a difference of two cubes (aka two cubes being subtracted): 64, which is 4^{3}, and y^{3}.

There is rule for the difference of two cubes:
The difference of two cubes is equal to the difference of the cube roots times a binomial, which is the sum of the squares of the roots plus the product of the roots.

That sounds pretty confusing, but it's much easier to understand when put mathematically. Let's say our two cubes are a^{3} and b^{3}. The difference of those two cubes is:
a^{3} - b^{3} = (a - b)( a^{2} + ab + b^{2})

In our problem, a = 4 (since a^{3} = 64) and b = y (since b^{3} = y^{3}. Plug these values into the rule to find the factor of 64 - y^3:
64 - y^3 \\&#10;= (4 - y)( 4^{2} + 4y + y^{2}) \\&#10;=  (4 - y)( 16 + 4y + y^{2})

-----

Answer: (4 - y)( 16 + 4y + y^{2})

8 0
2 years ago
Which expression is equivalent to 4(5j + 7)?
frozen [14]

Answer: 4(5j+7) = 20j+28

Step-by-step explanation:

5 0
3 years ago
What is the exact value that is 48% of 1165
Vera_Pavlovna [14]

We know that the percentage amount of any number can be found by first converting the the given percentage to a fraction and then multiplying it by the given number. Thus, in our case, the exact value, that is 48% of 1165 can be calculated as follows:

We know that 48\%=\frac{48}{100}=0.48

Therefore, 48% of 1165 can be re-written as: 0.48\times 1165

This can be calculated as [tex]0.48\times 1165=559.2[/tex

Therefore The exact value that is 48% of 1165 is 559.2


5 0
3 years ago
Hey guys I just wanted to put this out there-
tino4ka555 [31]

ok thank you so much for the info

5 0
3 years ago
Which one i greater 2/8 or 1/2 ?
ryzh [129]
\frac{2}{8}=\frac{1}{4}\\&#10;\frac{1}{2}=\frac{2}{4}\\\\&#10;\frac{2}{4}>\frac{1}{4} \Rightarrow\frac{1}{2}>\frac{2}{8}
5 0
2 years ago
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