Identify the lateral area and surface area of a regular triangular pyramid with base edge length 14 cm and slant height 15 cm

L = 630 cm2 ; S = 484.7 cm2
L = 630 cm2 ; S = 399.9 cm2
L = 315 cm2 ; S = 484.7 cm2
L = 315 cm2 ; S = 399.9 cm2

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?