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pav-90 [236]
2 years ago
7

What is the value of the expression 4 x (2a - 1) if a = 3? 16 20 23 25

Mathematics
2 answers:
valentinak56 [21]2 years ago
6 0
3x2=6-1=5 then 5x4=20
olga_2 [115]2 years ago
4 0

Answer:

20

Step-by-step explanation:

⇒ Multiply 2 by 3

2 * 3 = 6

4 (6 - 1)

⇒ Distribute terms

4 * 5

20

Hence, the answer is 20.

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This is a System Of Equations and I'd like it to get solved by the Elimination or Substitution Method.x+2y=83x+5y=8
Sonbull [250]

Answer:

x=133 y=-25

Step-by-step explanation:

I'll do both ways for you. So let's start with Substitution:

With the sub method, you have to set both equations equal to each other by setting them equal to the same variable. Since there is no coefficient in front of both x's in both equations, that variable will be easiest to solve for.

x + 2y = 83    &    x + 5y = 8

Solve for x.

x = 83 - 2y     &    x = 8 - 5y

Once you have solved for x, set each equation equal to one another and solve for y now.

83 - 2y = 8 - 5y

Isolate all variables to one side:

83 = 8 - 3y

Now subtract the 8 to fully isolate the y variable:

75 = -3y

Divide by -3:

-25 = y   Now that you have your first variable, plug it into one of the original equations and solve for x.

x + 2(-25) = 83

x - 50 = 83

x = 133

Now for the Elimination method. For this method you need to get rid of a variable by either subtracting/adding each equation together. Again, since you can subtract and x from both equations, you will be left with only the y variable to solve:

Put each equation on top of one another and subtract:

  x + 2y = 83

- (x + 5y = 8)

The x's will cancel out:

(x - x) + (2y - 5y) = (83 - 8)

Simplify:

-3y = 75

Solve for y

y = -25

Then, plug y = -25 into one of the original equations:

x + 5(-25) = 8

Solve for x:

x - 125 = 8

x = 133

Hope this helps!

8 0
2 years ago
i need help with this question aka all the little questions in it. Will give brainliest!! Worth 10 pts but EXTRA if needed as pa
polet [3.4K]
A: x= 2.5
b: y= 12.9
c: z= 12
d: w= 2.75
e: t= 4
(Lemme know if it’s wrong)
6 0
3 years ago
Read 2 more answers
which of the following algebraic expression can be used to express the statement three less than z squared
frez [133]
z^{2}-3
3 0
3 years ago
Last math question. 6th grade math
Karolina [17]

Answer:

The bag contains fewer than 10 carrots.

Catherine biked farther than 10 miles.

The chair is shorter than 20 inches.

Carlos scored over 20 points.

Hope that helps you sorry if it doesn't.

4 0
2 years ago
Read 2 more answers
PLEASE HELP!!
allsm [11]

Answer:

im guessing?

Step-by-step explanation:

each=4921

3 0
3 years ago
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