How many strings of length 5 are there over the alphabet {h, i,j} that either begin with jor end with j ?

In the given triangle, ∠aed ∼ ∠ abc, ad = 6.9, ae = 7.2, de = 5.2, and bc = 10.2. find the measure of bd and ce. round your answer to the nearest tenth.

How are algebraic expressions evaluated using substitution?

Solve the system of equations. 2x-2y=-4 and x+y=8. show work