The total amount they spent is the cost of pizza and 4 large drinks. This amount is also the sum of the amount of gift certificate and the cash $13.20. Let x be the price of each drink. The equation would be,
13 + 4x = 6 + 13.20
The value of x from the equation is 1.55. Thus, each large drink costs $1.55.
This pattern forms an arithmetic sequence with the first term
. The difference between two consecutive terms of this sequence is 6. The rule to calculate the other term of the sequence is is to add 6 to the previous term. This can be archived as shown in the calculations below,

The first terms of this sequence are 5, 11, 17, 23,29.
Answer:
9
Step-by-step explanation:
Setup a proportion
= 
Cross multiply
40n = 360
Divide by 40
40n/40 = 360/40
n = 9
Answer:
Y=75x
Step-by-step explanation:
If you plug in the x's to the equation, it fits because 2 x 75 is 150, and that's the point.