help me solve these

17. [-/4 Points] DETAILS HUNTERDM3 4.5.004. MY NOTES Let x and n be integers greater than 1. Consider the following algorithm. t - 0, 5- 0 for / E {1, 2, ... , x} do for jE {1, 2, ... , n} do to t+ x LS- S+t / / line A The " and L symbols and the indentation are important: they tell you which lines are inside which loop. So, for example, line A is inside the i-loop, but outside the j-loop. (a) If x = 4 and n = 5 initially, what is the value of s after this segment executes? (b) Count the number of additions this segment performs. Your answer should be in terms of x and n. 18. [-/4 Points] DETAILS HUNTERDM3 4.1.018A. MY NOTES How many different four-letter strings can be formed from the letters A, B, C, D, E (repeats allowed) if the first letter must be a vowel and the last letter must be a consonant