Answer:
Rational
Step-by-step explanation:
A rational number can be written as a fraction of the form.

and a and b are integers.

Hence in this case a=999 and b=100.
Since both are integers with b being a non-zero integer, we conclude that 9.99 is a rational number.
Answer:
13
Step-by-step explanation:
sqroot of 144+25=√169=13
Answer:
Step-by-step explanation:
vector u=<(11-(-7),(-5-2)>=<18,-7>
as direction is opposite to u
so vector v=-3(18,-7)=(-54,21)
120-114.27=5.73 Add the numbers, then subtract 120 from them.
Answer:
The answer is approximately 1.21.
Step-by-step explanation:
Using a calculator, enter in acos(6/17) or cos^-1(6/17)