A jumbo jet maintains a constant airspeed of 550 miles per hour​ (mi/hr) headed due north. The jet stream is 90 ​mi/hr in the northeasterly direction. (a) Express the velocity va of the jet relative to the air and the velocity vw of the jet stream in terms of i and j.
(b) Find the velocity of the jet relative to the ground.
(c) Find the actual speed and direction of the jet relative to the ground.

Answer is in the file below

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2. angles qrt and qst both measures 156 degrees.

step-by-step explanation:  

we have been given a diagram of a circle and we are told that measure of arc qvt is 156 degrees.  

we can see from our given diagram that angle qrt and angle qst subtends to arc qvt.

since we know that angles subtended by the same arc at the circumference are always equal.

by angle subtended by same arc theorem, measure of angle qrt and angle qst will be equal to the measure of arc qvt.

therefore, angles qrt and qst both measures 156 degrees and 2nd statement is the correct choice.