How can you express (32 + 56) as a multiple of a sum of whole numbers with no common factor?
A - 2 × (16 + 28)
B - 4 × (8 + 14)
C - 3 × (15 + 18)
D - 8 × (4 + 7)

The hypotenuse of a 45 -45 -90 triangle measure 7 square root 2 units

Using elimination, what is -4x+2y=-12 4x+8y=-24

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.