75% of the girls in miss thomas class own a smartphone compared to. 62.5% of the boys. if there are 20 girls and 8 boys in miss thompson class. how many students own a smart phone

Find the value of the cosine for angle a

Anyone know? will mark brainliest if correct!

Aplane flies around trip to philadelphia it flies to philadelphia at 220 miles per hour and back home with a tailwind at 280 miles per hour if the total trip takes 6.5 hours how many miles does the plane fly round trip