Without graphing, decide whether the system of equations has one solution, no solution, or infinitely many solutions. y = 7x + 4
y = -7x + 4

How many solutions does the system of equations have?

What are the relative frequencies to the nearest hundredth of the columns of the two-way table?

Kayla wants to find the width, ab, of a river. she walks along the edge of the river 65 ft and marks point c. then she walks 25 ft further and marks point d. she turns 90° and walks until her location, point a, and point c are collinear. she marks point e at this location, as shown. (a) can kayla conclude that δ and δ are similar? why or why not? (b) suppose de = 15 ft. what can kayla conclude about the width of the river?

7. the area of the playing surface at the olympic stadium in beijing isof a hectare. what area will it occupy on a plan drawn to a scaleof 1: 500?