The first three terms of an arithmetic sequence are given. Find an expression for tn in terms of n, and write the tenth term for each sequence. PLEASE HELP ASAP!! a, 2a, 3a, . . .

tn = ?
t10 = ?

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Can someone me and do the problem plz so i can understand it more better

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

Three baby penguins and their father were sitting on an iceberg 0.50.50, point, 5 meters above the surface of the water. the father dove down 4.74.74, point, 7 meters from the iceberg into the water to catch dinner for his kids. what is the father penguin's position relative to the surface of the water?