Which of the following products is negative? Select all that apply.
A. (–4)(–9)
B. (–4)(9)
C. (6)(6)
D. (–6)(–6)
E. (6)(–6)

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

The tiles below are pieces of a normal ecg tracing representing a little less than two heartbeats at a resting rate of 80 bpm. arrange the tiles in their correct order. rank from first to last. do not overlap any tiles.

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?