Answer:
Step-by-step explanation:
x+y=a
a=x+y
x−y=b
b=x−y
Good luck honey!
Mean 6.6
Median 6
Mode 3
Range 10
not positive on the 6.6 but the rest should be good
Answer:
a = -5
Step-by-step explanation:
15 - a = 20
Move the constant of 15 to the other side by subtracting it.
-a = 5
Divide by -1 to make a positive.
a = -5
Check.
15 - (-5) = 20
15 + 5 = 20
20 = 20
Lisa picks 75
Lisa = L
Sharon = S
L = 5S
L = 75
75 = 5S
75/5 = 5S/5
S = 15
hope this helps
Answer is a1 = 7
Using equation (derived from formula to find sum of values in a geometric series),

Hence, solve for a.