For the data in the table tell whether y varies directly with x if it does write an equation for the direct variation

x y
3 5.4
7 12.6
12 21.6

a. not a direct variation.
b. direct variation, y=1.8x
c. direct variation, y=4x
d. direct variation, y=5/9x

for the data in the table tell whether y varies directly with x if it does write an equation for the direct variation.

x y
-2 1
3 6
8 11

a. not a direct variation.
b. direct variation, y=x
c. direct variation, y=2x
d. direct variation, y=-2x

Marco is studying a type of mold that grows at a fast rate. he created the function f(x) = 345(1.30)x to model the number of mold spores per week. what does the 1.30 represent? how many mold spores are there after 4 weeks? round your answer to the nearest whole number. 1.30 represents the number of mold spores marco had at the beginning of the study; 985 mold spores 1.30 represents the number of mold spores grown in a given week; 448 mold spores 1.30 represents the 30% rate of weekly growth; 345 mold spores 1.30 represents the 30% rate of weekly growth; 985 mold spores

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²

This graph shows which inequality? a ≤ –3 a > –3 a ≥ –3 a < –3