The time to complete a standardized exam in the byu-idaho testing center is approximately normal with a mean of 70 minutes and a standard deviation of 10 minutes. using the 68-95-99.7 rule, approximately what percentage of students will complete the exam in under fifty minutes? give your answer accurate to one decimal place.

∠acb = 8°

step-by-step explanation:

∠xba lies on the circle and is half the measure of the intercepted arc ax

hence

measure of arc ax = 2 × 42° = 84°

∠acb is outside the circle and is

∠acb = (arcab - arcax ), hence

∠acb = 0.5 (100 - 84) = 0.5 × 16° = 8°

d i think

step-by-step explanation:

answer: 819.89 miles across america

step-by-step explanation:

to find the perimeter, you add up all the lengths of the sides. in this case you would have to add up 18+22+40+80 which equals 160.