Agroup of 120 students were asked how old they were when they lost their first tooth. 50% said they were 7 years old. how many said they were 7 years old when they lost their first tooth? explain.

Let f(x) = x+3 and g(x) = 1/x the graph of (fog)(x) is shown below what is the range of (fog)(x)?

Which of the following is true for the relation f(x)=2x^2+1

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.