Select the three hypotheses. Grass prevents erosion when planted on a hillside.

Eating sweets may affect weight gain in children.

Brand X battery maintains a charge longer than brand Y.

Hummingbirds are aggressive animals.

A child will catch a cold if she plays in the rain.

If a plant receives fertilizer, it will grow at a faster rate.

force is mass*acceleration.

we have a very small mass: 11.4*0.001 kg

if we want 0.035n of force, we need an acceleration:

0.035 = 11.4*0.001*a

a = 0.035/(11.4*0.001) m/s^2

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form

total distance/total time

(85 + 82)/(5+3)

167/8

20 just over