On a piece of paper, use a protractor and a ruler to construct triangle ABC with AB = 8 cm, m∠A = 90°, and m∠B = 45°.
What is the measure of AC?

A. 12 cm
B. 8 cm
C. 3 cm
D. 6 cm

Please explain your answer!!!

Alex drew a circle with right triangle prq inscribed in it, as shown below: the figure shows a circle with points p, q, and r on it forming an inscribed triangle. side pq is a chord through the center and angle r is a right angle. arc qr measures 80 degrees.

Bob the builder is making 480kg of cement mix. this is made by cement, sand and gravel in the ratio 1: 3: 4

During the election for class president, 40% of the students voted for kellen, and 60% of the students voted for robbie. 500 students voted in total. how many more students voted for robbie than for kellen? answer with work : )