For emily's birthday, her father treated her and five friends to a dinner at a restaurant at the mall. emily and her friends ordered three pizza dinners at $6.25 each and three chicken baskets at $7.50 each. all six people ordered soft drinks costing $1.25 each. the sales tax on the meal was 4.5%, and the tip was 15%. what was the total cost of the meal, including the sales tax and the tip?

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 33 days later). the pool was open on monday, but it was closed on thursday. the high temperature was 30 ∘c on monday, but decreased at a constant rate in the next 33 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?