Please help The measures of the angles if a triangle are 40°, 50°, and 90°.

a. Classify the triangle by its angles.

b. Can the triangle be equilateral? Why or why not?

c. Can the triangle be isosceles? Why or why not?

d. Can you classify the triangle by its sides? Why or why not?

Can someone with this one pre-calc question? the finishing time for a runner completing the 200-meter dash is affected by the tail-wind speed, s. the change, t, in a runner's performance is modeled by the function shown below: t= 0.0119s^2 - 0.308s - 0.0003 predict the change in a runner's finishing time with a wind speed of 3 meters/second. note: a negative answer means the runner finishes with a lower time. round to the nearest hundredth.

It costs 4.25 for 1 pound of roast beef. how much will it cost to purchase 2.5 pounds of roast beef? round to nearest cent

You decide instead to take the train there. the train will take 135 minutes. convert this into hours and minutes.