Brittney and Bradley are going on a canoeing trip down the Red River. They canoe to elk island, stop for lunch for one hour, and then return home. The current is flowing at 6.0 mi/h downstream and they paddle a total of distance of 21 miles. Their total trip time was 6.3 hours, including their 1-hour break for lunch. How long does it take them to reach Elk Island on the first half of their trip?

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6.(q^9)^2 a. 2q^18 b. q^18 c. q^81 d.q^11 7.(6q^6)^-4 a. 6q^1296 b. 1296q^2 c. 1/1296q^24 d. 6q^-24 8. what is the value of 12x^-3 y^-1 for x = -1 and y = 5? a. -12/5 b.-10 c.-0 d.5/12 9. (y^-5)^10y^10 a. y^-60 b. y^60 c. y^-150 d. y^150 find the simplified form of each expression. 10. (4/7^5)^2 a.8/14^10 b.16/49^25 c.16/49y^10 d.8/14y^25 11. determine if the number 3.43 times 10^-6 is written in scientific notation. if not, explain. a. yes; the number is written scientific notation. b. no; the first factor is not a number between 1 and 10. c. no; it is not written as a number times a power of 10

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Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c