Write an arithmetic sequence that has a common difference of -3 and whose fourth term is 17. * the answer

see explanation

Step-by-step explanation:

Given d = - 3 and a₄ = 17

To obtain terms before a₄ , then do the opposite and add 3 , that is

a₃ = a₄ + 3 = 17 + 3 = 20

a₂ = a₃ + 3 = 20 + 3 = 23

a₁ = a₂ + 3 = 23 + 3 = 26

Then arithmetic sequence is

26, 23, 20, 17,

36 girls

step-by-step explanation:

the 48 boys is 4 parts of the ratio

divide 48 by 4 to obtain one part of the ratio

= 12 ← 1 part of the ratio

3 parts = 3 × 12 = 36 ← number of girls