How many solutions are there to the equation x1 + x2 + x3 + x4 + x5 + x6 = 25 in which each xi is a non-negative integer and …

(a)there are no other restrictions.

(b) xi ≥ 3 for i = 1, 2, 3, 4, 5, 6

(c) 3 ≤ x1 ≤ 10

(d) 3 ≤ x1 ≤ 10 and 2 ≤ x2 ≤ 7

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ab=4 and bc=3, find ah, ch and bh.

If 20% of a number is 35, what is 50% of that number?

Cody started biking to the park traveling 15 mph, after some time the bike got a flat so cody walked the rest of the way, traveling 4 mph. if the total trip to the park took 6 hours and it was 46 miles away, how long did cody travel at each speed? solve using rate times time= distance