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3 years ago

Help!!! Please will give points

Mathematics

1 answer:

galben [10]3 years ago

3 0

Option D:

The solution to the equation is y = 27.

Solution:

Given equation:

$$\frac{1}{3} y=9$

To solve this equation:

$$\frac{1}{3} y=9$

Multiply by 3 on both sides of the equation.

$$3 \times \frac{1}{3} y=9 \times 3$

3 in the numerator and denominator get canceled.

y = 9 × 3

y = 27

The solution to the equation is y = 27.

Option D is the correct answer.

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If f(x)=8-10x and g(x)=5x+4, what is he value of (fg)(-2)

Lana71 [14]

Answer:

168

Step-by-step explanation:

We would like to multiply these two expressions together and then substitute -2 in for x to solve.

f(x) * g(x) = (8 - 10x) * (5x + 4)

We will use FOIL (first, outer, inner last):

(8 - 10x) * (5x + 4) = 8 * 5x + 8 * 4 + (-10x) * 5x + (-10x) * 4

Combining terms, we get:

f(x) * g(x) = 32 - 50x²

Plug -2 in for x:

32 - 50 * (-2)² = 32 - 50 * 4 = 32 - 200 = -168

The answer is thus 168.

~ an aesthetics lover

3 0

2 years ago

When solving this system of linear equations with the elimination method, you can multiply the bottom equation by 3.

tekilochka [14]

Answer: The correct option is A.

Explanation:

The system of equations is,

$3x+6y=38$

$5x-2y=-30$

When solving this system of linear equations with the elimination method, we can multiply the bottom equation by 3.

$3(5x-2y)=3(-30)$

This step works because according to the multiplication property of equality,

If,

$a=b$ ... (1)

Multiplied both side by m then,

$ma=mb$ ..... (2)

Then (1) and (2) are equivalent equations.

So, by multiplication property of equality, the second equation can be multiply by 3.

Therefore, he correct option is A.

3 0

2 years ago

Read 2 more answers

PLEASE HELP MEE (40 points) will Mark BRAINLIEST!

Lady_Fox [76]

Need more information on the choice, please provide

4 0

2 years ago

If 2x + 5 = 8x, then 12x = ?A.5B.10C.15D.20

butalik [34]

<h2>Answer:</h2> $10.\text{ Option B is correct}$

<h2>Explanation:</h2>

Given the equation expressed as:

$2x+5=8x$

First, we need to calculate the value of "x" from the given expression.

Step 1: Given the equation 2x + 5 = 8x

Step 2: Subtract 5 from both sides:

$\begin{gathered} 2x+5-5=8x-5 \\ 2x+\cancel{5}-\cancel{5}=8x-5 \\ 2x=8x-5 \end{gathered}$

Step 3: Subtract 8x from both sides

$\begin{gathered} 2x-8x=8x-8x-5 \\ -6x=\cancel{8x}-\cancel{8x}-5 \\ -6x=-5 \end{gathered}$

Step 4: Divide both sides by -6

$\begin{gathered} \frac{-6x}{-6}=\frac{-5}{-6} \\ x=\frac{5}{6} \end{gathered}$

Step 5: Get the value of 12x. Substitute x = 5/6 into the expression to have:

$\begin{gathered} 12x=12(\frac{5}{6}) \\ 12x=\cancel{12}^2(\frac{5}{\cancel{6}^1}) \\ 12x=2\times5 \\ 12x=10 \end{gathered}$

Therefore the value of 12x is 10

3 0

3 months ago

Out of 120 students in exam, 2/3 of them passed. How many students passed?

LenKa [72]

Out of 120 students in exam, 2/3 of them passed. How many students passed?

now,

no of students passed = 2/3×120

= 0.66×120

=80...

therefore 80 students were passed....

8 0

2 years ago

Read 2 more answers