If s(x) = 2 - x2and t(x) = 3x, which value is equivalent to (s•7)(-7)?

If a || b and e || f , what if the value of y ?

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.

What number is 7 units left of -15?