He bikes 4/10 of a mile in 1/5 of an hour
That is 4/10 miles in 1/5 hours
Average speed = Distance/ time = 4/10 ÷ 1/5 = 4/10 × 5/1 = 2 miles/hour
Answer:

Step-by-step explanation:
Given

Required
Fill in the gaps
Going by the given parameters, we have that

, when factorized is 
Hence; the expression becomes

Combine Fractions

Simplify the denominators

By direct comparison


Hence, the complete expression is

Answer:
Step-by-step explanation:
it is 0.5 since
y=25(0.5)x
since x is a variable that change usually describes the independent variable, and 25 is the sample that starts with, so 0.50 is the number that represent the decayed rates.
1 is the correct answer my guy