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alexira [117]
3 years ago
15

PLEASE HELP BRAINLIEST REWARDED TO CORRECT ANSWER

Mathematics
2 answers:
worty [1.4K]3 years ago
6 0

Answer:

Mickey should have added –4 and 2 when combining the coefficients of the x terms.

Step-by-step explanation:

Mickey simplified the expression below. He then checked his work by substituting 4 for x. He noticed his two values were not equal

Expression: 2x^2 - 4x - 9 - x^2 + 2x + 3

Simplified expression: x^2 - 6x - 6

2x^2- x^2 - 4x + 2x - 9  + 3

x^2 -2x -6

-4x +2x = -2x (both have different sign so we subtract)

Mickey should have added –4 and 2 when combining the coefficients of the x terms.

geniusboy [140]3 years ago
5 0
The answer is a, hope this helped
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6 0
3 years ago
Ardie bought 547 acres of land for development. If 29 acres of his purchase is reserved for a park, how many two-acre building l
9966 [12]

Hey there!


First, is he used 29 out of the 547 for a park, he can't use them for two acre building lots, so we must subtract:


547-29 = 518


If we want to know how many 2 acre building lots we can sell, we can divide 518 by 2, as dividing it by 2 sees how many times 2 goes into 518- essentially how many two acre lots are in 518 acres.


This gives us 259 two-acre building lots.


Hope this helps!

8 0
3 years ago
A horse gallops a distance of 60 m and 15 seconds. Then, he stops to eat some grass for 20 seconds. Next, he trots for 25 second
zzz [600]

Answer: check the attached graph for the answer

Step-by-step explanation:  Please find the attached file for the solution

6 0
4 years ago
Please help with the this give tiny explanation
Mila [183]

Answer:

21

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5 0
3 years ago
The sum of two numbers is 2. Their difference is -16. What is the first number?
Helen [10]

Answer: The first number is 4

Explanation: Since the sum of the two numbers is ten, x + y = 10

Also, since the difference of the two numbers is two, then x - y = 2

Since x - y = 2, another way to write that is x = y + 2 and since x is exactly the same as y + 2, we can plug in "y + 2" in place of x in the first equation (x + y = 10) to get (y + 2) + y = 10. Then we solve this equation by combining like-terms.

2y + 2 = 10

2y = 8

y = 4

Since x = y + 2, x = 4 + 2 or x = 6

I hope this helped you!

7 0
3 years ago
Read 2 more answers
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