Could anyone solve this using matrices showing work?

the three medals earned in the olympics are the gold, silver, and bronze medals. in the 2014 winter olympics, the united states had 28 total medal winners. there were two more gold medals than silver medals and the number of bronze medals was four less than the sum of the number of gold and silver medals. how many winners were there of each type of medal?

The data in the table represent the height of an object over time. which model best represents the data? height of an object time (seconds) height (feet) 05 1 50 2 70 3 48 quadratic, because the height of the object increases or decreases with a multiplicative rate of change quadratic, because the height increases and then decreases exponential, because the height of the object increases or decreases with a multiplicative rate of change exponential, because the height increases and then decreases

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

In need of in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.