There are 3 yellow marbles and 4 silver marbles in a bag. You randomly choose one of the marbles. What is the probability of choosing a yellow marble? Write your answer as a fraction in simplest form.
The probability of choosing a yellow marble is?

What is the correlation coefficient between the variables? round to three decimal places. enter your answer in the box

What is the total surface area of this square pyramid?

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.