We have to use Pythagorean theorem that says :

$a^2+b^2=c^2\\\Rightarrow a^2+15^2=39^2\\a^2=39^2-15^2\\a=\sqrt{1296}\\a=36$

The missing length of the triangle is : 36 feet

3 0

2 years ago

What is the first geometric sequence below

ale4655 [162]

Notice that if you go forward, the common ratio is 5. Each new term is found by mult. the previous term by 5.

If, on the other hand, you go backwards (terms decreasing), then you divide a term to find what the previous term was.

Here, divide 1 by 5 to find the first term. It's 1/5.

5 0

2 years ago

Jamie has 625 in his checking account he writes two checks for 23 each and then makes one deposit of 146 what is his final balan

LenaWriter [7]

His final balance is 725

7 0

3 years ago

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