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Jobisdone [24]
2 years ago
8

2(x+3) = 5x + 6 - 3x is it true or false

Mathematics
2 answers:
Anna007 [38]2 years ago
8 0

Answer:

True

Step-by-step explanation:

2(x+3) = 5x+6-3x

2x+6=5x-3x+6

2x+6=2x+6

Alik [6]2 years ago
6 0

Answer

True

Step-by-step explanation:

Cause 2×X=2x and 2×3=6

so total = 2× + 6 =5× + 6 - 3x

or, 2x + 6 = 5x - 3x + 6

or, 2x + 6 = 2x + 6

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Molodets [167]

Answer:

C seems right to me

Step-by-step explanation:

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2 years ago
Your firm has a contract to make staff uniforms for a fast-food retailer. The heights of the staff are normally distributed with
FromTheMoon [43]

Answer:

a) 16%

b) 2.5%

Step-by-step explanation:

a)

The mean is 70 with standard deviation(SD) of 3 and you are asked to find out the percentage of staff that have <67(70-3 inch= mean - 1 SD) inch size, which means 1 SD below the mean (<-1 SD). Using 68-95-99.7 rule, you can know that 68% of the population is inside 1 SD range from the mean ( -1 SD to + 1 SD).

To put it on another perspective, there are 32% of the population that have < -1 SD and > +1 SD value. Assuming the distribution is symmetrical, then the value of < - 1 SD alone is 32%/2= 16%

b)

The question asks how many populations have size >76 inches, or mean + 2 SD (70+3*2 inch).

You can also solve this using 68-95-99.7 rule, but you take 95% value as the question asking for 2 SD instead.  Since 95% of population is inside 2 SD range from the mean ( -2 SD to + 2 SD), so there are 5% of population that have < -2 SD and > +2 SD value. Assuming the distribution is symmetrical, then the value of > +2 SD alone is 5%/2= 2.5%

3 0
2 years ago
Evaluate the expression y = 6 and X = 7 : x+9y
Vladimir79 [104]

Answer:

y=6,x=7

then,

x+9y

putting value

=6+9.7

=6+63

=69

4 0
3 years ago
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