5. a.) 8.73/450x100=1.94
b.) 8.73/450≈0.02
c.) 450/8.73x25≈1289
7 a.) 622/12≈52km per hour
b.) 622/0.5=1244 km per hour ( that's .......impossible...)
Those are your answers.
The markup is 150%
126/84= 1.5
1.5 x 100 = 150%
Proof : 1.5 x 84 =126
The surface area of the cube is 384 square mm. Hope it help!
