Please help.
Is algebra.

4. b)

5. b)

Step-by-step explanation:

4.

First, one must rewrite the exponential equation as a multiplication problem,

Now distribute, multiply every term in one of the parenthesis by every term in the other parenthesis,

Now simplify the given expression,

Combine like terms,

5.

To solve this problem, one should follow the same series of steps as they did to solve the last expression. First, rewrite the exponential expression as a multiplication problem.

Now distribute, multiply every term in one of the parenthesis by every term in the other parenthesis,

Simplify the expression,

Finally, combine like terms,

step-by-step explanation:

you estimate that the angle of elevation to the top of the 86th floor (the observatory) is 82 .the total height of the building is another 123 meters above the 86th floor.

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