In 1972, an item cost $0.28. Now the same item costs $1.02. What is the approximate percent increase of the cost of the item?

Which value of m will create a system of parallel lines with no solution? y= mx - 6 8x - 4y = 12

Luis has a cooler filled with cans of soda. for every 5 cans of coke there are 3 cans of sprite. if there are 25 cans of coke, how mant cans of sprite are there?

The pyraminx is a rubik's cube-type toy in the shape of a tetrahedron. the pyraminx shown below has edges 15\,\text{cm}15cm long and vertical height h=12.2\,\text{cm}h=12.2cm. the triangle drawn with dashed lines is a right triangle. what is the distance rr? round your answer to the nearest tenth.