2 years ago

Please help me I don’t know

Mathematics

1 answer:

sineoko [7]2 years ago

4 0

Answer:

study more so you can understand

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Help me on this question, I'll give brainlist for the correct answer.

german

Answer:

Step-by-step explanation:

The first expression has value 12

The second expression has value -6

The third expression has value

And finally the forth expression has value 1.14

((13 + 7) = 20

(12+4) = 16

16/ (20 - 16)= 16 / 4

16/4 = 4

8 0

3 years ago

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54x^3 +250y^3<br> in the sum of cubes<br> please helpppp

Slav-nsk [51]

Answer:

What is exactly the question?

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3 years ago

If y varies directly as (x+3) and inversely as (x-3) and y=21 when x=4, what is the equation for y in terms of x?

igor_vitrenko [27]

$\bf \qquad \qquad \textit{double proportional variation}
\\\\
\begin{array}{llll}
\textit{\underline{y} varies directly with \underline{x}}\\
\textit{and inversely with \underline{z}}
\end{array}\implies y=\cfrac{kx}{z}\impliedby 
\begin{array}{llll}
k=constant\ of\\
\qquad variation
\end{array}\\\\
-------------------------------\\\\$

$\bf \textit{\underline{y} varies directly as (x+3) and inversely as (x-3)}\implies y=\cfrac{k(x+3)}{x-3}
\\\\\\
\textit{we also know that }
\begin{cases}
y=21\\
x=4
\end{cases}\implies 21=\cfrac{k(4+3)}{4-3}\implies 21=\cfrac{k(7)}{1}
\\\\\\
\cfrac{21}{7}=k\implies 3=k\qquad thus\qquad \qquad \boxed{y=\cfrac{3(x+3)}{x-3}}$

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3 years ago

The difference of twice a number and another number is 5. The sum of the two numbers is 19. Find the numbers

joja [24]

Answer:

12 & 7

Step-by-step explanation:

12 + 7=19

12 - 7=5

7 0

2 years ago

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