Mark brought a pair of sunglasses in the USA. He paid $38.50 in England an identical pair costs £28.99 the exchange rate was £1=$1.32 . Which country were the sunglasses cheaper?

C is a circle with centre the origin. A tangent to C passes through the points (-30, 0) and (0, 10) Work out an equation of C. You must show all your working.

Michael randomly selected 30% of the 7th grade students at school to found out their favorite season. What is a reasonable prediction of the number of 200 7th graders who would choose summer as their favorite season?

C is a circle with centre the origin. A tangent to C passes through the points (-30, 0) and (0, 10) Work out an equation of C. You must show all your working.