Hanna travels 70 miles at an average speed of 60 mph. She then travels a further 40 miles. The average speed for the entire journey is 46 mph. Assuming Hanna didn't stop, what was her average speed for the final 40 miles to 2 dp?

dc=6 square root of 3 and ac is 12 square root 3

c and d

step-by-step explanation:

square root of 3/2 = 18/c

cross multiply to get 18*2=√3*c

36/√3 * √3/√3 = c

c= 36*√3/3

c=12√3

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9

true

step-by-step explanation:

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step-by-step explanation:

left be aligning the decimal points is required to not required see the number of digits to the right