Motorboat travels 9 miles downstream (with the current) in 30 minutes. The return trip upstream (against tt takes 90 minutes.
Which system of equations
can be used to find x, the speed of the boat in miles per hour, and y, the speed
current in miles per hour? Recall the formula d = rt.
• 9 0.5(x - y)
9 = 1.5(x + y)
- 1.5(x -y)
9 = 0.5(x + y)
0.5 = 9(x - y)
1.5 = 9(x + y)
1.5 = 9(x -y)
0.5 = 9(x + y)

i just took the test, the correct answer is .. 31.5 in.

pentagon

step-by-step explanation:

the coordinates   a(5, -2), b(3,-1),c(-4,-4) d(-3,8) and e(-1,4) forms the vertices of the polygon when they are connected in order.

in order to classify that which polygon is it with the given coordinates, first count the number of vertices and then count the number of sides it can make with these vertices.

since, the given coordinates have five vertices, therefore, it will make five sides. moreover, pentagon is regular in nature therefore it will be convex.

now, a polygon with five sides is known as pentagon, therefore, the given polygon is the pentagon.