PLEASE HELP! The range of a human’s hearing frequency, H, is about 20 ≤ H ≤ 20,000.

The relationship between a human’s hearing frequency and a bat’s hearing frequency, B, is H = 20 + 999/5950(B – 1000). Find the range of a bat’s hearing frequency.

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

Sketch the region enclosed by the given curves. decide whether to integrate with respect to x or y. draw a typical approximating rectangle and label its height and width. y= 5x, y=7x^2then find the area s of the region.

Barney & noblet customers can choose to purchase a membership for $25 per year members receive 10% off all store purchases 1. how much would a member pay per year if he bought $50 worth of items each year? 2. write a slope-intercept equation that expresses how much a member pays per year using x to represent his purchases per year 3. how much would a member have to spend per year to pay off his membership fee?