Aprepaid cell phone charges a preset number of minutes to use text messaging. the graph represents y, the number of minutes used for x, the number of text messages sent and received. is there a direct variation? which equation represents the relationship? yes, y = 2x. yes, y = 20x. no, y = x + 10. no, y = x + 20.

9.4.34  question   to estimate the height of a stone  figure, an observer holds a small square up to her eyes and walks backward from the figure. she stops when the bottom of the figure aligns with the bottom edge of the  square, and when the top of the figure aligns with the top edge of the square. her eye level is 1.811.81 m from the ground. she is 3.703.70 m from the figure. what is the height of the figure to the nearest hundredth of a  meter?

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )

If the tip varies directly with the number of guest which equation represents between the tip,t, and the number of guest,g?