The price for 3 sundaes and 3 milkshakes is $21. the price for 4 sundaes and 6 milkshakes is $34. how much does it cost for 1 sundae and 2 milkshakes?

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years