Need 4th grade fraction word problems

The pair of coordinates that do not represent the point( 5,150’) is a. (5,-210) b. (5,210) c. (-5,330) d. (-5,-30)

The length of an intercepted arc of a central angle of a circle is 4 cm. if the radius of the circle is 5 cm what is the measurement of the central angle to the nearest whole degree

Solve the system of equations using the substitution method. {y=−3x+7x=−2y−16 enter your answers in the boxes.