Devin is training for a competitive race by swimming and running. He covers a total distance of 9 km by swimming for 45 minutes and running for 20 minutes. The following day he swims for 30 minutes and runs for 40 minutes, covering a total of 14 km. Which system of linear equations can be used to find Devin's swimming rate (x) and his running rate (y) in kilometers per hour? A) 3 4 x + 1 3 r = 9 1 2 x + 2 3 y = 14 B) 3 4 x + 1 3 y = 14 1 2 x + 2 3 y = 9 C) 3 4 x + 1 3 y = 9 1 2 x − 2 3 y = 14 D) 3 4 x + 1 3 y = 23 1 2 x + 2 3 y = 23

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.

step-by-step explanation: the answer for wha if rt is 10 centimeters long, and wha is st? it’s 6