13. how is 0.00069 written in scientific notation?
a. 69 x 10–5
b. 6.9 x 104
c. 0.69 x 10–3
d. 6.9 x 10–4

With these: 18/36 = 1/? missing number change 1 5/8 to improper fraction. change 19/5 to a mixed number.

Two cyclists 84 miles apart start riding toward each other at the samen time. one cycles 2 times as fast as the other. if they meet 4 hours later what is the speed (in miles) of the faster cyclists

Which is the scale factor proportion for the enlargement shown?