Three angles of a quadrilateral are congruent. The fourth angle is twice as big as each of the other angles. Which system of equations can be
used to find the measures of the angles? (Note: The four angles of a
quadrilateral add up to 360.)

A. y=360 -2x
y = 3 x

B. y=360 -x
y =2x +3x

C. y =360-5x
y =3x + 2x

D. y=360-3x
y = 2x

What number must you add to complete the square x^2+12x=16

Which expression is equivalent to 5r6141 2r+st6

Since opening night, attendance at play a has increased steadily, while attendance at play b first rose and then fell. equations modeling the daily attendance y at each play are shown below, where x is the number of days since opening night. on what day(s) was the attendance the same at both plays? what was the attendance? play a: y = 8x + 191 play b: y = -x^2 + 26x + 126 a. the attendance was never the same at both plays. b. the attendance was the same on day 5. the attendance was 231 at both plays on that day. c. the attendance was the same on day 13. the attendance was 295 at both plays on that day. d. the attendance was the same on days 5 and 13. the attendance at both plays on those days was 231 and 295 respectively.