Pls help I don't get the answer

0.5

Step-by-step explanation:

We have the formula

N is the number of steps per minute, and we know that Heiko takes 70 steps per minute, making N 70. Now we can reverse this simple formula - if n over p is 140, then 140 X P gives us N. Or, in other words, 70 divided by something is 140. 70 divided by a half is 140, making P 0.5.

$18

Step-by-step explanation:

To find a percent of a number, change the percent to a decimal by dividing it by 100, and multiply the decimal by the number.

4% of $450 = 4% * $450 = 0.04 * $450 = $18