June+rode+her+bike+18+miles+in+90+m inutes.+chris+rode+his+scooter+12+m iles+in+72+minutes.+who+traveled+at +a+greater+average+speed? +define+an+appropriate+unit+of+spee d

Step-by-step explanation:

June: 18 miles in 90 minutes. Now you want to use the unit m/h; so we're going to find how many miles are rode in 1 hour. 1 hour is 60 minutes and 90 divided by 60 is 1.5. So you are also going to divide 18 by 1.5 which equals 12 m/h.

Chris: do the same equation for Chris; 72÷60= 1.2 and then 12÷1.2= 10 m/h.

363 square inches

step-by-step explanation:

surface area of a pyramid is b + 1/2ph

b is the area of the base: 11 x 11 = 121

p is the perimeter of the base: 11 + 11 + 11 + 11 = 44

h is the height of the pyramid: 11

121 + 1/2(44)(11)

121 + 242

363