Translating into a mathematical equation:
n + n^2 = 72
Rewriting, n^2 + n - 72 = 0
Factoring, (n+9)(n-8) = 0
Solving for n: n = -9 or n = 8
You must check both answers before accepting one, the other or both.
Example: suppose we check out n = 8. Then 8 + 8^2 = 72 is true, and n = 8 is a solution. Is n = -9 a solution? Try it.
Let's define the following variable:
t = total time it takes to assemble a shelving unit together.
We then have the following equation:
1/5 + 1/3 = 1 / t
Solving the equation we have:
3t + 5t = 15
8t = 15
t = 1,875 hours
Answer:
the time it takes for worker A and worker B to assemble a shelving unit together is:
t = 1,875 hours
The expression (cosx)/(1 - sinx) is similar to the answer D. cos(x)/(1 - sin(x)).
Answer: 615.75 mm^2
Step-by-step explanation:
(Note: I rounded the answer)
223
-119
----------
Subtract 9 from 3. To do this, you must borrow:
The first digit of the answer is thus 13-9=4.
Next, you must subtract 1 from 1, obtaining 0.
Lst, you must subtract 1 from 2, obtaining 1.
Putting all of these results together: 1 0 4, or 104.
Check: Does 104 + 119 = 223?
1
104
+119
-------
223
yes.
