Write the sum in summation notation. 3 + 7 + 11 + 15 + 19

(Answer choices)
sum of ((4k - 1)) from (k=1) to (5)
sum of ((k + 2)) from (k=3) to (19)
sum of ((3k + 2)) from (k=3) to (19)
sum of ((4k + 1)) from (k=1) to (5)

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Angle xyz is formed by segments xy and yz on the coordinate grid below: a coordinate plane is shown. angle xyz has endpoints at 3 comma negative 1 and 6 negative 2 and 3 comma negative 3 and measures 36.87 degrees. angle xyz is rotated 270 degrees counterclockwise about the origin to form angle x′y′z′. which statement shows the measure of angle x′y′z′?

What rule describes a dilation with a scale factor of 4 and the center of dilation at the origin?