Which of these formulas models this arithmetic sequence?

5.9, 5.5, 5.1, 4.7, 4.3, . .

an = -0.4 + (n – 1) × 5.9

an = (n – 1) × (-0.4)

an = 5.9 + (n – 1) × (-0.4)

an = 5.9 + (n – 1) × 0.4

what is the question?

step-by-step explanation:

answer: the angel abc is 30°,and the abc is a triangle where the angel bac is 90°

so ac is the half of 24=12ft,and from the pythagorean theorem we find ba

ba=√bc^2-ac^2=√576-144=√432=12√3ft

so bac is 12+12√3=12(1+√3)ft

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15

the first domain and range set to the left is matched with the top relation, and the second set the set in the middle goes with the bottom relation.