Answer:
x ∉ R
Step-by-step explanation:
x² = - 21
if x² < 0 => x ∉ R
Answer:
-5/10 equals to 5/-10 because even though the numerator/denominator is negative, when you simplify -5/10 or 5/-10, it give you -1/2 and 1/-2.
Step-by-step explanation:
ANSWER
$18,000
EXPLANATION
Ginny has $10,000 in a savings account.
The interest is 4% simple interest.
We want to calculate Ginny's total account balance after 20 years.
To do this, we will first caluclate the interest and then we will add it to the initial balance.
To calculate Simple Interest, we use:

P = principal = $10000
R = rate = 4%
T = time = 20 years
Therefore:

Therefore, her account balance after 20 years is:
Amount = $10000 + $8000 = $18,000
I know that one is obtuse and acute
Answer: The answer is D
Step-by-step explanation: It is the only option that makes sense to me.