Please help and explain

x = 71

Step-by-step explanation:

Since the 2 legs are congruent ( both 21 ) then the triangle is isosceles.

Thus the base angles are congruent, then

x = = = 71

hello from mrbilldoesmath!

answer:

a(n) - a(n-1) -3

discussion:

this ones a bit interesting. given a(n) = 5 - 3n consider this:

a(n-1) = 5 - 3(n-1)

          = (5 - 3n) + 3             => but a(n) = 5 - 3n, the first term

          = a(n)   + 3                 => subtract 3 from both sides

a(n-1) -3 = a(n)  

or

a(n) - a(n-1) -3

you,

mrb

the answer would be 484

step-by-step explanation:

just multiply 0.484 times 1,000 (formula)