Answer:
letter C: 100
Step-by-step explanation:
This problem can be configured as an arithmetic progression:
The first value is 10, the ratio is also 10 (the multiples of ten are 20, 30, 40, ...) and the number of terms is 19 (10, 20, 30, ... , 180, 190 -> total of 19 numbers).
So, we can use the following formula to calculate the sum of all these numbers:
Sn = n(a1 + an)
/2
where Sn is the sum, n is the number of terms, a1 is the first term and an is the last one.
The result we want is the average of the sum, so we need to divide Sn by n:
Average = Sn/n = n(a1 + an)
/2n = (a1 + an)
/2 = (10+190)/2 = 200/2 = 100
The correct option is letter C.
Answer:
30x-15y
Step-by-step explanation:
5 * 6x = 30x
5 * -3y = -15y
Answer:
16
Step-by-step explanation:
to complete the square we add (b/2) ^2 to each side where b is the coefficient of the x term
(-8/2) ^2 = (-4)^2 = 16
add 16 to each side
Answer:
0 i think
Step-by-step explanation:
Answer:
20 Dollars
Step-by-step explanation:
4 dollars x 5 dollars = 20 Dollars
hope this helps
