Adding fractions with the some bottom number

Which expression calculates the speed in meters per second of an object that travels a distance of 100 m every 20 seconds

Place the following steps in order to complete the square and solve the quadratic equation,

Which equation is true? i. 56 ÷ 4·7 = 82 ÷ (11 + 5) ii. (24 ÷ 8 + 2)3 = (42 + 9)2 neither i nor ii ii only i and ii i only