3, 10, 17, 24. what is the 50th term in the sequence

Check if you can write an equation relating the term number to the actual value

n1=3

n2=10 = 3+7

n3 = 17 = n2+7 = n1+7+7 = n1 + 2*7

n4 = 24 = n1+3*7

so you will notice a pattern

for the x-th term

n_x = 3 + (x-1) * 7

the 50th term would be n_50 = 3 + (50-1) * 7