Miguel asked sandra to make 90 cookies for his party. sandra needs ¼ cup of sugar to make 15 cookies. she incorrectly calculated the amount of sugar she will need.
write a brief note to sandra describing her mistake and explain to her how to correctly

sandra's work:
amount of sugar for 1 cookie: 15 x 1/4c = 15/4 = 3.75 c
amount of sugar for 90 cookies: 3.75 c x 90 = 337.5 c

Acable company wants to provide cell phone service for residents on an island. the function for the cost of laying the cable from the island to the mainland is c(x)= 6.500 square root x2+4, where x represents the length of the cable in feet. what are the domain and range of the function? a) domain: all real numbers range: all real numbers greater than or equal to 17,000 b) domain: all real numbers greater than or equal to 0 range: all real numbers greater than or equal to 17,000 c) domain: all real numbers greater than or equal to 0 range: all real numbers greater than or equal to 13,000 d) domain: all real numbers greater than or equal to 13,000 range: all real numbers greater than or equal to 0

Maren is buying carpet for her rectangular living room. the room is 4.8 yards wide and 5.2 yards long. how much carpet does she need to buy? enter your answer as a decimal in the box. yd2

What is the value of the discriminant, b2 ? 4ac, for the quadratic equation 0 = x2 ? 4x + 5, and what does it mean about the number of real solutions the equation has?