Write an explicit formula for an, the nth term of the sequence 75, 15, 3,

aₙ = 75 x 0.2ⁿ⁻¹   or 75 x (1/5)ⁿ⁻¹

Step-by-step explanation:

a₁ = 75

a₂ = 75 x 0.2¹ = 75 x 0.2 ²⁻¹ = 15

a₃ = 75 x 0.2² = 75 x 0.2³⁻¹ = 3

aₙ = 75 x 0.2ⁿ⁻¹   or 75 x (1/5)ⁿ⁻¹

38.5

step-by-step explanation:

lets say, first number = r

second number = 3r+7

total = 49

(r)+(3r+7)= 49

4r+7 = 49

4r = 42

r = 42/4

r= 10.5

3r+7 = 3(10.5)+7 = 38.5

hope this

4x and 6y

im not sure though