The table shows the height of water in a pool as it is being filled. A table showing Height of Water in a Pool with two columns
and six rows. The first column, Time in minutes, has the entries, 2, 4, 6, 8, 10. The second column, Height in inches, has the entries, 8, 12, 16, 20, 24. The slope of the line through the points is 2. Which statement describes how the slope relates to the height of the water in the pool? The height of the water increases 2 inches per minute. The height of the water decreases 2 inches per minute. The height of the water was 2 inches before any water was added. The height of the water will be 2 inches when the pool is filled.
To calculate 9*52, we note that 9=10-1, so mentally calculate 9(52) =(10-1)(52) =520-52 [ subtract 20 from each number] =(520-20)-(52-20) =500-32 =468.
Alternatively, 9*52=9*50+9*2=450+18=468
If you're good with multiplication and division, 9*52=3*3(52)=3*156=450+18=468
