Answer:
r = 7
Step-by-step explanation:
The equation of a circle centred at the origin is
x² + y² = r² ( where r is the radius )
x² + y² = 49 ← is in this form
with r² = 49 ⇒ r = = 7
29.1 rounded to the nearest whole number is 29.
Its 81 because 729 divided by 3 and divided by 3 again is 81
10 - 8.56 = 1.44
1.44 / 8.56 = 0.1682.....
0.1682... x 100 = 16.8%
17% (nearest whole %)
$135 + $15x is greater than or equal to $300