The distribution of waiting time for an elevator in an office building is shown above. What is the probability you’ll have to spend between 30 and 70 seconds waiting for the elevator?

The solution set for 5v2 – 125 = 0 is

Math i have no idea how to do a and b

Will mark the brainliest.paula makes stained-glass windows and sells them to boutique stores. if her costs total $12,000 per year plus $4 per window for the frame. how many windows must she produce to earn a profit of at least $48,000 in one year if she sells the windows for $28 each?