6 repeating so the answer would be 31.666666..... or round it up 31.666666667
Answer:
see below
Step-by-step explanation:
The equation to determine the work time is
1/a+1/b = 1/c where a and b are the times alone and c is the time together
1/80 + 1/30 = 1/c
Multiply by the least common denominator to clear the fractions, which is 240c
240c(1/80 + 1/30 = 1/c)
3c+8c = 240
11c = 240
Divide by 11
11c/11 =240/11
c = 240/11 minutes
c=21.81818
Approximately 22 minutes
Answer:
4.79 or 4.789
Step-by-step explanation:
the first answer is if you need to round to the nearest hundredth, the second if you need to round to the nearest thousandth. you didn't tell us which was correct so I put both
Answer:
486
Step-by-step explanation:
you can find out the unknown side by pythagoras theorem
Answer:
The surface area of the cube is 
Step-by-step explanation:
we know that
The length of a diagonal of a cube is equal to

where
b is the length side of a cube
In this problem we have

so

solve for b

Simplify

<em>Find the surface area of the cube</em>
The surface area of the cube is equal to

substitute the value of b
