Answer:
10 + 5xy = -80
Step-by-step explanation:
10 + 5xy = ?
x = 9 and y = -2
10 + 5xy = 10 + 5(9)(-2)
= 10 - 90
= -80
Answer:
Last month's income: $1000
This month's income = $1200
Step-by-step explanation:
Number of subscribers for last month = 100
Fee per subscriber = $10
Sol, last month's income = 100(10) = 1000
This month, 30 new members joined and 10 of the existing members cancelled their subscription.
So, number of subscribers this month = 100 + 30 - 10 = 120
This month's income = 120(10) = 1200