I'll give brainliest > .<

janeka found the area of a circular side table with a diameter of 20 inches. explain the error(s) that she made. include the correct answer in your response.

a = π r²
a = π (20 in)²
a = 400 π in

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?

Can someone answer this question for me

Aculture started with 2,000 bacteria. after 8 hours, it grew to 2,400 bacteria. predict how many bacteria will be present after 19 hours . round your answer to the nearest whole number. p=ae^kt