Arithmetic sequences

Find $ S_{ 5 } $ ( sum of first $ 5 $ terms ) of arithmetic progression if $ a_1 = 5 ~~ \text{and} ~~ d = 5 $.

Find $ a_{ 5 } $ of an arithmetic progression if $ a_1 = 140 ~~ \text{and} ~~ d = 20 $.

Find $ a_{ 12 } $ of an arithmetic progression if $ a_1 = 40 ~~ \text{and} ~~ d = 10 $.

Find $ a_{ 10 } $ of an arithmetic progression if $ a_1 = 125 ~~ \text{and} ~~ d = 12 $.

Find $ a_{ 4 } $ of an arithmetic progression if $ a_1 = 52000 ~~ \text{and} ~~ d = \left( -8000 \right) $.

Find $ S_{ 10 } $ ( sum of first $ 10 $ terms ) of arithmetic progression if $ a_1 = 38 ~~ \text{and} ~~ d = 8 $.

Find $ a_{ 10 } $ of an arithmetic progression if $ a_1 = 38 ~~ \text{and} ~~ d = 8 $.

Find $ a_{ 11 } $ of an arithmetic progression if $ a_1 = 20 ~~ \text{and} ~~ d = \left( -2 \right) $.

Find $ a_{ 10 } $ of an arithmetic progression if $ a_1 = 200 ~~ \text{and} ~~ d = 24 $.

Find $ S_{ 4 } $ ( sum of first $ 4 $ terms ) of arithmetic progression if $ a_1 = 200 ~~ \text{and} ~~ d = 25 $.

Find $ a_{ 4 } $ of an arithmetic progression if $ a_1 = 200 ~~ \text{and} ~~ d = 25 $.

Find $ S_{ 6 } $ ( sum of first $ 6 $ terms ) of arithmetic progression if $ a_1 = 2 ~~ \text{and} ~~ d = 2 $.