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3 years ago

What is the value of f(X)=3x-12 for X=9

Mathematics

1 answer:

Phantasy [73]3 years ago

8 0

F(X)=3x-12 Substitute 9 for x. f (9)=3 (9) -12 Multiply 9 by 3. F (9)= 27 -12 Subtract Final Answer: 15

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12. Solve 7x - 5x - 3 = x + 4. O AX-8 B. X 6 C.X -10 D. X= 7

Harrizon [31]

Answer:

D. X=7

Step-by-step explanation:

Use the order of operations to solve this problem.

First, combine like terms.

7x-5x=2x

Our equation is now 2x-3=x+4

Now, add 3 to both sides.

Our equation is now 2x=x+7

Subtract x from both sides.

x=7

The answer is D. X=7

Feel free to ask any questions.

Hope this helps!

4 0

2 years ago

SOMEONE PLEASE HELP!!

jeyben [28]

Answer:

RV = 18

Step-by-step explanation:

The diagonals of a parallelogram bisect each other, then

RV = $\frac{1}{2}$ RT = $\frac{1}{2}$ × 36 = 18

5 0

3 years ago

Help me with this question I will mark brainlist no web link Solve :- 9n²-64=0

Archy [21]

Factorize

(3n + 8) (3n - 8) = 0
3n + 8 = 0 and 3n - 8 = 0

Solve both for n

3n + 8 = 0
3n = -8
n = -8/3

3n - 8 = 0
3n = 8
n = 8/3

Therefore n = -8/3 and n = 8/3

6 0

2 years ago

James has 6 stamps in his stamp collection. Roy has 12 stamps in his stamp collection. James adds 2 stamps to his stamp collecti

Alina [70]

2:3

it was originally 8:12, but it has to be simplified. 2/3 can also work as an answer.

6 0

3 years ago

If anyone is good at math and likes to help someone that is not good with it I will give you brainliest

hammer [34]

Answer:

1st pic answer:

Slope= -3

Parallel slope= -3

Perpendicular slope = 1/3

2nd pic answers:

1 and 2 are parallel

1 and 3 are perpendicular

2 and 3 are perpendicular

Step-by-step explanation:

To find the slope in your first equation (6x+2y=1) you need to get y alone so that your equation will be in slope-intercept form (y=mx+b).

6x+2y=1 Start by subtracting the 6x over to the other side.

-6x -6x

2y= -6x+1 Next divide by 2 to get y completely alone.

$\frac{2y}{2} =\frac{-6x}{2}+\frac{1}{2}$

y= -3x+1/2

So to answer the first part your slope is -3. Parallel slope would be the same as your regular slope. Perpendicular would be the opposite, so that means you have to flip it and change the sign.

-3 flipped is -1/3

if you change the sign it becomes positive giving you 1/3

Part 2

Your first step would be to get all the equations into the slope-intercept form (y=mx+b). The second one is already in the form so we only need to change 1 and 3.

3y=5x+2 To get y alone you need to divide everything by 3.

$\frac{3y}{3}=\frac{5x}{3} +\frac{2}{3}$

y=5/3x+2/3 Before we work on equation 3 we can go ahead and compare equations 1 and 2.

1: y= $\frac{5x}{3} +\frac{2}{3}$

2: y= $\frac{5x}{3} +7$ Since 1 and 2 have the same slope they would be parallel.

Now to change equation 3.

6x+10y=8 Start by subtracting the 6x over to the other side.

-6x -6x

10y=-6x+8 Now divide everything by 10 to get y alone.

$\frac{10y}{10}=\frac{-6x}{10} +\frac{8}{10}$

y=-6x/10+8/10 Now we need to simplify the fractions using common factors. I'm going to use 2 for both equations, so you take -6 and 10 both divided by 2, which gives you -3 and 5(-3x/5). Now do the same with the other fraction. 8 and 10 divided by 2 gives us 4 and 5 (4/5)

3: y= $\frac{-3x}{5}+\frac{4}{5}$

2: y= $\frac{5x}{3} +7$

1: y= $\frac{5x}{3} +\frac{2}{3}$

Since three has an opposite slope of both 1 and 2 it would be perpendicular to both.

5 0

3 years ago