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Mariulka [41]
4 years ago
12

Tell me how to do it and why please

Mathematics
1 answer:
matrenka [14]4 years ago
8 0

Answer:

It would take them 6.667 minutes to paint 50 square feet together.

Step-by-step explanation:

This is a classic work problem.  If Sam can do the job in 10 minutes, she can get done 1/10 of the job in one minute.  If you can do the job in 5 minutes, you can 1/5 of the job done in one minute.  To find out how many minutes it will take them together to paint 25 square feet, set the addition of their times equal to 1/x:

\frac{1}{10}+\frac{1}{5}=\frac{1}{x}

x is how long it takes them to get the job done together.  Find the common denominator and multiply it through be everything to get rid of the denominators altogether.  That denominator is 10x:

(10x)\frac{1}{10}+(10x)\frac{1}{5}=(10x)\frac{1}{x}

Simplify to get the simple equation x + 2x = 10 and 3x = 10.  That means that x=3 1/3.  That's how long it takes to do 25 square feet.  Double that time for 50 square feet.

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Give f(x) = X2 + 3x-1, find b) f(-1)​
nikklg [1K]

Answer:

-3

Step-by-step explanation:

f(x)= x²+3x-1

f(-1)= (-1)²+3(-1)-1

= 1-3-1

= -2-1

= -3

7 0
3 years ago
Ms. Jones is paid $1500 per week but is fined $150 each day she is late to work. Ms. Jones wants to
Sav [38]

Answer:

6 days <u>Please at least say thanks and leave a good review</u>

Step-by-step explanation:

1500 per week works 4 weeks

maximum would be 6000

if she is late 6 days she loses 900 dollars and would be left with 5100

if she is late 7 days  she loses 1050 and would be left with 4950 so she can be late no more than 6 days

7 0
3 years ago
Read 2 more answers
HELP I WILL MARK BRAINLIEST
Shkiper50 [21]

Answer:

308

Step-by-step explanation:

22 x 15.4 = 338.8

338.8 / 1.1 = 308

5 0
2 years ago
A maps key shows that every 5 inches on the map represents 200 miles of actual distance. Suppose the distance between two cities
ryzh [129]
Hello there, and thank you for posting your question here on brainly.

Short answer: 280 miles.

Why?

You can find this out by finding out how much 1 in is by dividing 200 by 5. (200 / 5 ==> 40) So 1 in = 40 miles. Now, we multiply that by 7, so we can find out how much 7 in would be. (7 * 4 ==> 280) 7 inches on the map represents 280 miles.

Hope this helped you! ♥
3 0
3 years ago
CAN SOMEONE SOLVE NUMBER 4 FOR ME? ILL GIVE BRAINLIEST
kirza4 [7]

Answer:

Ms. sim is not correct

Step-by-step explanation:

Rectangular Prism A

4 x 5 x 6 =

4 x 5 = 20

20 x 6 = 120 cm cubed

Rectangular Prism B

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3 x 7 = 21

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5 0
3 years ago
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