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jenyasd209 [6]
4 years ago
15

HELP! 20 POINTS

Mathematics
1 answer:
guajiro [1.7K]4 years ago
7 0
Work problems are solved by first figuring out how much of the job they can do  in each hour. Shawn can do 1/4 of the job in an hour and Ellie can do 1/6 of the job in an hour. 1/6+1/4=2/12+3/12=5/12. This means that they can do 5/12 of the job an hour. This means that together they can do the job in 2 2/5 hours. The foreman is obviously wrong because first of all Shawn can do it alone in 4 hours, so with Ellie he will do it faster, and second of all 2 2/5<5. Hope this helped!
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The slope intercept form of the equation 4x - y = -1
adell [148]

Answer:

y=4x-27

Step-by-step explanation:

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3 years ago
32% of 50 please answer fast need help ............
aleksklad [387]
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A local shoe store is having a clearance sale on their summer shoes. The table below shows the sale price of each type of shoe.
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4 0
3 years ago
Suppose a normal distribution has a mean of 79 and a standard deviation of 7. What is P(x ≥ 72)?
Zina [86]

Approximately 65% of the distribution lies within one standard deviation of the mean, which is to say,

P(72 ≤ x ≤ 86) ≈ 0.65

Normal distributions are symmetric, so the percentage of values one standard deviation below the mean is equal to the percentage of values one standard deviation above the mean.

P(72 ≤ x ≤ 79) = P(79 ≤ x ≤ 86)

but since the sum of these make up P(72 ≤ x ≤ 86), we find

P(72 ≤ x ≤ 79) ≈ 0.65/2 = 0.325

Also due to symmetry, exactly half of the distribution lies to either side of the mean; namely,

P(x ≥ 79) = 0.5

It follows that

P(x ≥ 72) = P(72 ≤ x ≤ 79) + P(79 ≤ x)

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8 0
3 years ago
PLZ HELP FAST!!
bazaltina [42]

The trapezoid's area is 126 inch².

Step-by-step explanation:

Step 1:

The trapezoid's area is calculated by averaging the base lengths and multiplying it with the trapezoid's height.

The trapezoid's area, A = \frac{b_{1}+b_{2}}{2} h.

Here b_{1} is the lower base and b_{2} is the upper base, height is h.

Step 2:

In the given diagram,

b_{1} = 12 inches and b_{2}= 2+12+2=16 inches and h = 9 inches.

A = \frac{b_{1}+b_{2}}{2} h = \frac{12+16}{2} (9) = 14(9)= 126 inch².

So the given trapezoid's area is 126 inch².

8 0
4 years ago
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