The present ages of a father and his son are 40 years and 8 years respectively. How many years ago, the product of their ages was 105?​

6 years ago

Step-by-step explanation:

Product is the answer to a multiplication problem, so we must multiply.

40 x 8 = 320 This is not the answer; 1 year ago

39 x 7 = 273 This is not the answer; 2 years ago

38 x 6 = 228 This is not the answer; 3 years ago

37 x 5 = 185 This is not the answer; 4 years ago

36 x 4 = 144 This is not the answer; 5 years ago

35 x 3 = 105 This is the answer; 6 years ago

a28=58

step-by-step explanation:

a1=a1+(n-1)d

a28= 4+ (28-1)2

a28=4+(27)(2)

a28=4+54

a28=58