Answer:
Explanation:
(1) Yes, the table is proportional
4.5/25 = 5.4/30 = 6.3/35 = 7.2/40
= 0.18
For a $50 bill the donation will be
50 X 0.18 = $9
Hence, 0.18 times of the dinner bill is donated to charity
(2) Yes, this is also proportional
a1 = 0.47
a2 = 0.68
a3 = 0.89
a4 = 1.10
d = a2 -a1 = a3 -a2 = a4 - a3
= 0.21
For a 6 ounce letter the A.P will be a6 so
a6 = a + 5d
= 0.47 + 5(0.21)
= 0.47 + 1.05
= 1.52
Hence , For every ounce of weight the cost gets increased by 0.21 the weight