Help me at least with one exercise

Calculate:

a) The density of the gasoline knowing that a 500 L drum has a mass of 430 Kg.
b) The mass of a piece of glass with a volume of 10 cm3, knowing that the density of the glass is 2.2 g/cm3.
c) The volume of a steel ball of 14 g of mass if the dsteel = 5500 Kg/m3.
d) The mass of 1 L of olive oil (d= 0,85 g/cm3).

Researchers determine that the biodiversity in a woodland region is declining. they identify two major threats to the region's biodiversity, a method to address each threat, and the expected outcome of each method. this information is shown in the table. a) reforestation would not benefit many species because most forest species live on the ground. b) reforestation would take the longest time to be effective because trees take several years to grow. c) biological augmentation would benefit only a few species because is is typically not very effective. d) biological augmentation would take less time to ve effective because it targets the majority of prey species.

Abike rider starts from rest and accelerates 28.0 meters down a slope in 5.00 seconds. what is her acceleration? select one: a. 3.21 m/sec2 b. 1.75 m/sec2 c. 9.80 m/sec2 d. 2.24 m/sec2

Astone is dropped from a cliff and falls 9.44 meters. what is the speed of the stone when it reaches the ground? a. 13.6 m/sec b. 1.39 m/sec c. 185 m/sec d. 9.80 m/sec