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Karolina [17]
3 years ago
11

What 2 numbers add up to 17 and multiply to get -84?

Mathematics
1 answer:
kicyunya [14]3 years ago
6 0
21 and -4, because -4x21 = -84, and 21+-4 (– 4) = 17
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PLEASE HELP ME I WILL MARK BRAINLYEST
Korvikt [17]

                               Question 9:

Given the equations

5x+2y=6;

4x-8y=0

solving the system of the equations

\begin{bmatrix}5x+2y=6\\ 4x-8y=0\end{bmatrix}

\mathrm{Multiply\:}5x+2y=6\mathrm{\:by\:}4\:\mathrm{:}\:\quad \:20x+8y=24

\mathrm{Multiply\:}4x-8y=0\mathrm{\:by\:}5\:\mathrm{:}\:\quad \:20x-40y=0

\begin{bmatrix}20x+8y=24\\ 20x-40y=0\end{bmatrix}

20x-40y=0

-

\underline{20x+8y=24}

-48y=-24

\begin{bmatrix}20x+8y=24\\ -48y=-24\end{bmatrix}

-48y=-24

\frac{-48y}{-48}=\frac{-24}{-48}

y=\frac{1}{2}

y = 0.5 ( 0.5 is the result of rounding 0.5 to the nearest 0.01)

\mathrm{For\:}20x+8y=24\mathrm{\:plug\:in\:}y=\frac{1}{2}

20x+8\cdot \frac{1}{2}=24

20x+4=24

\frac{20x}{20}=\frac{20}{20}

x=1.00 ( 1.00 is the result of rounding 1 to the nearest 0.01 )

So, the solution is:

(x, y) → (1.00, 0.5)

                            Question 10)

Similarly the question 10 can be solved.

Given the equations

5x+2y=9;\:4x-3y=44

solving

\begin{bmatrix}5x+2y=9\\ 4x-3y=44\end{bmatrix}

\mathrm{Multiply\:}5x+2y=9\mathrm{\:by\:}4\:\mathrm{:}\:\quad \:20x+8y=36

\mathrm{Multiply\:}4x-3y=44\mathrm{\:by\:}5\:\mathrm{:}\:\quad \:20x-15y=220

\begin{bmatrix}20x+8y=36\\ 20x-15y=220\end{bmatrix}

20x-15y=220

-

\underline{20x+8y=36}

-23y=184

\begin{bmatrix}20x+8y=36\\ -23y=184\end{bmatrix}

-23y=184

y=-8.00   ( -8.00 Rounded to the nearest 0.01 or  the Hundredths Place )

\mathrm{For\:}20x+8y=36\mathrm{\:plug\:in\:}y=-8

20x+8\left(-8\right)=36

20x=100

x=5.00  ( 5.00 Rounded to the nearest 0.01 or  the Hundredths Place )

So, the solution is:

(x, y) → (5.00, -8.00)

8 0
3 years ago
Which functions has the fastest rate of increase?
Mashcka [7]
The function with the higgest rate of increase is 2^x
6 0
3 years ago
12 is 8% of what number?
jeka57 [31]
We can also say this in another way ... (8% of what number is 12?)
let a be the number of which 8 % is 12 ....
<span>8/100 x a =12 </span>
<span>a=12 x 100/8 </span>
<span>a=(6/4) x 100 </span>
<span>a=(3/2) X 100
a = 150  </span>

<span>now if u want to check your answer.. substitute the value of a .....</span>
<span>(8/100) x 150=12 ....

Hope it helps !!!</span>
7 0
3 years ago
Read 2 more answers
75 pts if you can awnser this
stellarik [79]

Answer:

x = 4

Step-by-step explanation:

2.5x +6 = 3.25x +3

-2.5x         -2.5x

6 = 0.75x +3

-3              -3

3 = 0.75x

divide by 0.75 both sides

4 = x

or

x = 4

7 0
3 years ago
Read 2 more answers
PLEASE HELPP!!
alexandr1967 [171]

Answer:

189

Step-by-step explanation:

-7 times -9 would give 56 and then multiplied by 3 gives 189.

7 0
3 years ago
Read 2 more answers
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