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Natasha_Volkova [10]
3 years ago
8

Which is the following have the correction solution? Select all that apply.

Mathematics
1 answer:
Mars2501 [29]3 years ago
8 0

Answer:

(b) is correct.

Step-by-step explanation:

We substitute the given  value of x in each equation and see if they fit.

a) 3x + 7 = 10   Plug in x = -1:

3(-1) + 7 = 4  so this solution is incorrect>

b) is correct because

5(5+4) - 5 = 45 - 5 = 40.

c and d are incorrect.

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Answer:

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Step-by-step explanation:

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Identify the solution set of the inequality using the given replacement set x < –2; {–5, –2.6, –2, –0.8, 1, 1.5}. A. {–5, –2.
Olenka [21]
If x < - 2 and x ∈ { - 5, - 2.6, - 2, - 0.8, 1, 1.5 }
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Answer:

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3 0
2 years ago
the average mark of three pupils are 68. what is the ratio of 5:4:3. how many marks did the best student get? HELP ME! ​
noname [10]

Answer:

85, 68, 51

Step-by-step explanation:

Average: The sum of all the numbers divided by the number of numbers

If the ratio of the scores is 5 : 4 : 3, let's just set it as 5x : 4x : 3x

Then using the definition of an average, we can write this equation.

(5x + 4x + 3x) / 3 = 68

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Simplify.

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Now, substitute x = 17 into the original scores (5x, 4x, and 3x)

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Just in case, let's check this answer. Find the average of the 3 test scores.

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