A carpenter can do a job in eight hours. His assistant can do the same job in ten hours. How long would it take them to do the job together?

it will take them about 4.44 hours to complete the job when they work together

Step-by-step explanation:

If carpenter B can complete the job in 8 hours, then the portion (fraction) of the job done in the unit of time (one hour) by this carpenter is 1/8

The assistant A can complete the same job in 10 hours, so the fraction of the job done by him in one hour is: 1/10

When they work together, we don't know what time it will take (we name it "x" hours). Therefore the fraction of the job dome in these x hours would be: 1/x

Now we can set the equation that says that the fraction of the job done by B in the unit of time plus the fraction done by A should equal the fraction completed when they work together:

Therefore, it will take them about 4.44 hours to complete the job when they work together.

answer: get jesus in your life

step-by-step explanation:

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.