Question

Shawn and Ellie are construction workers. Shawn can complete a concrete job in 4 hours, while Ellie can complete it in 6 hours. The foreman says that it will take them 5 hours to complete it if they work together. Explain each step in solving this equation, and determine if the foreman is correct or not.

Answer 1

The foreman is incorrect. If one person can finish the job alone in 4 hours then working together the job must be done faster than that

To do the proper calculation let x be the number of hours

Shawn does 1/4 of the job per hour so his contribution is

(1/4)x

Same reasoning for Ellie’s being (1/6)x

Adding them together to complete 1 full job

(1/4)x + (1/6)x = 1
Solve for x

Answer 2

In what contemporary genre is an essay such as Joseph Bruchac's u201cKeepers of the Earthu201d memoir best classified?
A.

Answer 3

There was a story that the present box had been made with some pieces of the box that had preceded it, the one that had been constructed when the first peop

Answer 4

Find the derivative of

Answer 5

PLEASE HELP!!
Complete the analogy below.
amplitude : loudness :: frequency : _________
A.

Answer 6

PLEASE HELP!!
Sound waves can best be described as _________.
A. opaque
B. polarized
C.

Answer 7

Which of the following major contributions were made by Maury?

creating navigati

Answer 8

Cousteau and Gagnan _____.

invented SCUBA
lived in Sealab II
developed u201csign

Answer 9

A scientist is studying the effect on human health of bacteria that live in the human intestine.

Answer 10

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Answer 11

Find the derivative dy/dx if

Answer 12

Alice wanted to compare birthday cake prices in two supermarkets. She wrote down the daily prices for a few days and found that the difference of the two sa

Answer 13

which of the following was directly caused by germanys invasion of Belgium

Answer 14

How do Hallyu2019s memories help advance the plot?

They suggest that Hally is afraid of his father.

Answer 15

math help pls

Answer 16

"If we fight the stranger, we shall hit our brothers and perhaps shed the blood of a clansman.

Answer 17

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Answer 18

Solve.
33=8^5z+4

Answer 19

A car is moving southwest at a velocity of 10 meters per second. Five seconds later, it's going 40 meters per second.

Answer 20

If you run 10 km east and then turn around and run 7 km west, how much total distance have you travelled?
A.

Answer 21

Which of the following is a vector measurement?
A. 0.08 g/L
B. 6.5 m/s down
C. 45 m/s slowly
D. 15 km/hr