Answer:
21
Step-by-step explanation:
It is 21 since 21 = 3 * 7.
The other 3 numbers are prime.
Answer:
$10 profit
Step-by-step explanation:
560+280=840
850-840=10
Answer:
C 9i
D -9i
Step-by-step explanation:
sqrt(-81)
sqrt(81) sqrt(-1)
we know that sqrt(-1) = i
±9i
Answer:
A. 4 units
Step-by-step explanation:
The amount the insurance company expects to make on average on every student the pays is found as follows: