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Umnica [9.8K]
3 years ago
9

Evaluate the expression. -x^2 -4x: x =. -3

Mathematics
1 answer:
Ierofanga [76]3 years ago
7 0
Substitute the x-value into the expression and solve it. -x^{2} - 4x Substitute all the x variables for 3 -3^{2} - 4(3) Use PEMDAS and start with the exponent (-3^{2} = -3 x -3 = 9) 9 - 4(3) Multiply 9 - 12 Subtract -3
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Cloud [144]

Answer:

x = 45

y = 37

z = 23

Step-by-step explanation:

x + y + z = 105

x = z + 22

x + 15 = y + z

(z + 22) + 15 = y + z

              37 = y

           x + y + z = 105

(z + 22) + 37 + z = 105

                     2z = 46

                       z = 23

    x + y + z = 105

x + 37 + 23 = 105

               x = 45

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3 years ago
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Answer:

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7 0
3 years ago
Question 1 through 6 . <br> THANKS.
Sergio039 [100]
Remember, these are quadrilaterals, so they must add up to 360°. Just add up the angles and then do 360 minus that number to solve for x. Therefore: 1. 118 + 90 + 99 = 307 360 - 307 = 53 2. 110 + 96 + 78 = 284 360 - 284 = 76 3. 48 + 118 + 97 = 263 360 - 263 = 97 4. 105 + 99 + 64 = 268 360 - 268 = 92 5. 103 + 63 + 113 = 279 360 - 279 = 81 6. 95 + 80 + 88 = 263 360 - 263 = 97
4 0
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A study showed that the ratio of the number of people who get their news from social media to the number of people who their new
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Answer: 240 people get the news from social media

Step-by-step explanation:

The ratio of the number of people who get their news from social media to the number of people who their news elsewhere is 3:7

Total ratio is the sum of the proportion of those that get their news from social media and those that got their news elsewhere.

It becomes 3+7 = 10

Total number of people in the town is 800

To determine the number of people that got their news from social media, we will divide the proportion of those that get their news from social media by the total ratio and multiply by the total number of people in the town. It becomes

3/10 × 800 = 240

6 0
3 years ago
What is 2 7/8 plus 2 3/8 ?
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3 years ago
Read 2 more answers
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