When a mathematician writes QED at the end of a proof, what does this mean?

Neal buys a board game. He pays for the board game and pays $1.54 in sales tax. The sales tax rate is 5.5%. What is the original price of the board game?

Nathan solved this problem. Anya cut a ribbon into 5 equal pieces that each measured 6.9 in. How long was the original length of ribbon? Nathan thought the answer was 350 in. Is Nathan's answer reasonable? A. Yes, Nathan's answer is reasonable. B.

Which is the solution set of the compound inequality? - 4 < a + 2 < 10

Ardit has 8 chapters of a book left to read. He reads 2/3 of a chapter each day. How many days does it take to finish reading the book

Solve 4 (c + 2) < 4c + 10. No solution All Real Numbers c < 2 c > 2

What is the answer to 3n + 3 = 27

The mean of 3 consecutive terms in an arithmetic sequence is 10, and the mean of their squares is 394. What is the largest of the 3 terms?

A race at travels at a rate of 205 mph how far would it travel in 3 hours?

What is 8/20 of an hour

An actor invests some money at 9 % simple interest, and $24,000 more than three times the amount at 10 % simple interest. The total annual interest earned from the investment is $38,670. How much did he invest at each amount? Use the six-step method.