What is the sum of the arithmetic series 18 t=1 (3t-4) a. 234 b. 441 c. 25.5 d. 49

The given arithmetic series is

When t =1, we will get the first term,a, which is

When t =18, we will get the last term,l , which is

Now we use the formula of sum of n terms which is

Substituting the values of t,a and l, we will get

rick has $1400 and sally has $1500

step-by-step explanation:

to find amount of money rick has after 10 years :

principal = $1000 , time = 10 years , rate = 4% annually

to find amount of money sally has after 10 years :

her friend gives to pay her $50 per year, therefore money she has after 10 years = 50 × 10 = $500

also, sally gets $1000 after 10 years,

therefore, total amount of money sally has after 10 years = 500 + 1000 = $1500

so, after 10 years : rick has $1400 and sally has $1500

step-by-step explanation:

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