OK my paper says the numerical expression 5+12 represent the sum of 5 and 12. I don't understand

Caroline bought 20 shares of stock at 10 1/2, and after 10 months the value of the stocks was 11 1/4. If Caroline were to sell all her shares of this stock, how much profit would she make? A: $15 B: $10 C: $210 D: $225

Solve the formula P = 2L + 2W for L

A certain college randomly selected 30 freshman students who completed college algebra during their first semester.

Real Simple, A Boat traveled 112 miles downstream and back. The trip downstream took 4 hours. The trip back took 8 hours. What is the speed of the boat in still water? What is the speed of the current? An Explanation how would be much appreciated.

Evaluate 8j - k+14 when j = 0.25 and k = 1

george is driving at an average speed of 62 miles per hour. write an expression that would give his distance traveled for h hours. Make a table that records his distance for 3, 5.5., and 8.5 hours

There were 145 children that went to the park today and 60% of the children were boys. How many of the children were girls at the park? A. 58 B. 85 C. 87 D. 232

Does anyone know the answer to this question w (t) = 3t-1; t=4.2

Evaluate the following expressions for r = 13. a) (8 + r) x 3 b) 5r + 97

Water safety standards in southern California suggest that if a concentration of adenoviruses in the water is more than 1,000 per liter, further testing would have to be done to determine if the water was hazardous.