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bearhunter [10]
4 years ago
15

4. Evaluate the following expression for r= 5. 2(r2 - 8)

Mathematics
1 answer:
inessss [21]4 years ago
7 0

Answer:

The expression is equal to 4

Step-by-step explanation:

Given the expression 2(r2-8) and the equality for the variable r = 5. It is best to substitute this equality into the expression to solve for its corresponding value:

2(r2-8) =

2(2(r)-8),

2(2(5)-8),

2(10-8),

2(2),

4

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Please please please help me I'm really confused and I don't understand it ​
maxonik [38]
Answer : p=2

2p-2-5x=-2(7-2x)

First, work on the parentheses. So the -2 on the outside as to be multiplied by the 7 , which gets -14 . Then you multiply the -2 by the 2x, which is 4x.

It will go from -2(7-2x) to -14+4x
But if the -14+4x looks too confusing, you can just switch them around to look “normal”. So it would be 4x-14 .

Now that we’re finished with one side of the problem, we’ll go to the other side.

On the left side , there are two variables, or letters. Because they are the same letter (p) all you have to do is add them together.

3p
-5p
+—-
-2p

And then just carry the -2 that was originally there , so it’s -2p-2

Now the equation is
-2p-2 = 4p-14

So we’re going to add 2p to both sides.

The -2p on the left cancels out, and the 4p on the right side becomes 6p

-2 = 6p-14

Next, you are going to want to isolate the variable. (Leave the letter by itself) so you add 14 to the -14 , so it can cancel out. (AND DO THE SAME ON THE OTHER SIDE)
So, you add 14 to the -2 on the left of the equation. Which comes out to 12.

12 = 6p

Lastly, divide the 6p , so you can get the letter on it’s own. And do the same on the other side.

12 divided by 6 is 2

2 = p

OR

p = 2


4 0
4 years ago
X + 23 = 40 what does "x" equal??? PLz explain
vladimir1956 [14]
Hey there!

40 - 23 = 17

x = 17

Hope this helps
Have a great day (:
6 0
4 years ago
Read 2 more answers
Complete the stem-and-leaf plot for the list of test grades.73, 42, 67, 78, 99, 84, 91, 82, 86, 94
evablogger [386]
Stem/leaf
4/2
5/
6/7
7/3,8
8/2,4,6
9/1,4
4 0
2 years ago
Aaa please help - What score do you have to get on a 40 point test to receive a 90% ?
AnnyKZ [126]

Answer: 36

Step-by-step explanation:

To find out the score, you would divide the total number of points (40) by 100 and then times it by the percentage you want (90).

Hope this helps :)

5 0
3 years ago
Multiply binomial (x+4)(x+6)=
neonofarm [45]
Answer: x^2+10x+24

X*X= X^2
4X+6X= 10X
4*6= 24
Simply distribute
5 0
3 years ago
Read 2 more answers
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