Answer:
9
Step-by-step explanation:
24 - 6 = 18 divided by 2 is 9 so a must be 9
Answer:
With Riley's pattern, he will practice 2,000 total minutes in 25 days.
Step-by-step explanation:
Since Riley increased his practice time by 20, 20 times 40 is 80 minutes. And since he is repeating this in total of 25 days, 80 times 25 is 2,000.
Hope this helped you in some way. If not, then let me know.
Step-by-step explanation:

<span>We will start using a new way to indicate simplifying fractions. When a numerator or
a denominator gets simplified, we will cross it out with a slash and write the new
numerator or denominator next to it (either above it or below it).</span><span>The number you divide by (the 4) does not get indicated in any way! You only
think about it in your mind: “I divide 12 by 4, and get 3. I divide 20 by 4, and get 5.”</span><span>You may not see any advantage over the “old” method yet, but this shortcut will
come in handy soon.</span> <span />