Answer:
9 days
Step-by-step explanation:
Let x = days taken by C to do it alone
In one day, A can do: 1/12 (part of the whole work)
In one day, B can do: 1/18 (part of the whole work)
In one day, C can do: 1/x (part of the whole work)
In one day,together A, B and C can do: 1/4 (part of the whole work)
we have this equation:
1/x + 1/12 + 1/18 = 1/4
--> 1/x = 1/4 - 1/12 - 1/18 = 1/9
--> x = 9 (days)
Answer:
8 full turns
Step-by-step explanation:
80 cm is 8 times 10 cm, so is 8 times around the spool.
Alex must unwind 8 full turns of thread from the spool.
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He must unwind it once.
C. 113.04 in'2
STEP 1:
3.14 x 6'2 ~ 113.04
EXPLANATION:
The formula for solving the area of a circle is- 3.14 x r'2
r=radius
Because a negative number's absolute value is what's opposite of it on the number line, the answer would be D.) 4.78! Hope I helped :)