Since real numbers are closed with respect to division (i.e. the division between two real numbers is again a real number), the fraction
is a real number everytime both m and n are real numbers.
In other words, you can choose any real number m and any real number n, and their ratio will still be a real number.
Of course, you have to follow the only rule that you can't divide by zero, so the answer is more precisely

Writing the equation that governs this situation:
-3C - (2.5C/hr)x = -18C
Simplifying, -3 - 2.5x = -18, or 3 + 2.5x = 18
Combining like terms: 2.5x = 18-3 = 15
Then x = 15/2.5 = 6. The temp. will reach -18C after 6 hours.
Answer:
-x^6/125-y^3/64
Step-by-step explanation:
that's what it Got
A.1500
b.10.41
c.10.41
d.0.096 of a cake i guess.