The first five terms of a sequence are 7, 10, 13, 16, and 19. Which of the following functions define this sequence for all integers n ≥ 1?

1. f(n) = 4 + 3n
2. f(n) = 3n + 7
3. f(n) = 7(3)^n-1
4. f(n) = 4(3)^n-1

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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step-by-step explanation:

because 1/3 is a fraction. we can tell because there is a divisor symbol between the 1 and the 3. if we were to add 2 fractions together, we would add the numerators, which is the number on top, but not the denominators, which is the number on the bottom

1/3+1/3=2/3

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