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3 years ago

Help please?

Mathematics

1 answer:

romanna [79]3 years ago

8 0

Answer: It would take 9 hours for 4 painters to paint 720 feet of fence.

Step-by-step explanation:

1.) Calculate the time needed to paint the 720 ft fence with 2 painters.

a.) Divide 720 by 280 to get how many times greater 720 is than 280.

720 / 280 ≈ 2.57

b.) Multiply the time needed to paint the 280 ft fence with 2 painters by 2.57.

7 * 2.57 ≈ 18

2.) Calculate the time needed to paint the 720 ft fence with 4 painters.

a.) Assuming that each painter paints the same amount of fence, divide the time in half, as 4 painters is double the original amount, so it would take half of the time.

18 / 2 = 9

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In Janie's homeroom 54% of the students' families own a dog and 32% own a dog and a cat. What is the probability that a student'

pogonyaev

Answer:

51,111%

Step-by-step explanation:

We know that 45% have a dog but no cat. While 23% have both a dog and a cat.

Then Pr(X has cat|X has dog) = Pr(X has dog and cat)/Pr(X has dog)

= Pr(X has dog and cat)/Pr(X has dog) = 0.23/0.45 = 0.51 ≈ 51,111%

The probability that a student’s family owns a cat if the family owns a dog is 51,111%

6 0

3 years ago

Through (-4,6) and parallel to y=-3x+4

liraira [26]

Y=mx+b
parallel lines will have the same slope.

using the points (-4,6) and the slope for the parallel line -3 we can find b (the y intercept) for the line.

6 = (-3)(-4) + b
6 = 12 + b
-12 + 6 = -12 + 12 +b
-6 = b
so the line that runs through points (-4,6) and parallel to y= -3x+4 is:
y = -3x -6

7 0

3 years ago

Carlos is in the 12% tax bracket. Over the course of the year, he paid $2,000 in student loan interest. This $2,000 decrease in

gulaghasi [49]

Answer:

The $2,000 decrease in Carlos's taxable income will save him

$= \frac{12}{100} \times \$2000 = \$240.$

Step-by-step explanation:

i) Carlos is in the 12% tax bracket.

ii)The $2,000 decrease in Carlos's taxable income will save him

$= \frac{12}{100} \times \$2000 = \$240.$

3 0

3 years ago

Which point on the graph shows the amount of water in the bucket after 1 second? Hint: Type your answer in the form (x coordinat

Taya2010 [7]

Answer:

$\displaystyle \left(1,\frac{5}{12}\right)$

Step-by-step explanation:

<u>Graphs</u>

The graph shows the amount of water in gallons as a function of time in seconds.

We are required to find the amount of water in the bucked after 1 second. Since the graph does not show an exact location for t=1, we must find the equation of the line.

Two points are clear on the graph: (0,0) (12,5). This gives us the necessary information to find the equation of the line, which has the form:

$w=mt+b$