Answer:
36 years
Step-by-step explanation:
Let
x = Elga's age
Alvin's age = x + 7
Sum of their ages = 79
Sum of their ages = Alvin's age + Elga's age
79 = (x + 7) + x
79 = x + 7 + x
79 = 2x + 7
79 - 7 = 2x
72 = 2x
x = 72/2
x = 36
Elga's age = x = 36 years
Alvin's age = x + 7
= 36 + 7
= 43 years
Answer:
The domain is -1 ≤x< 5
The range is -3≤y<3
Step-by-step explanation:
The domain is the values that x takes
The domain is -1 ≤x< 5
The range is the values that y takes
The range is -3≤y<3
Actual cost = bill + VAT*bill
= bill*(1 +VAT)
= £463.20*(1 +0.20)
actual cost = £555.84
5x+14
You will collect the like terms
4 times 7 gets 28 and 7-4 gets you 3
