Are all isosceles triangles similar? Are all right triangle similar? Are all isosceles right triangles similar? Explain. Please don't answer with one answer, blank or a ridiculous response. This is serious please.

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Please explain each one.

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

You work for a landscape company that just got a contract to re-mulch a park. the area that needs mulching is 30 feet by 60 feet. they want a 3 inch layer of much on the area. the company has bags of mulch that cover 2 cubic yards that cost $4.00 per bag. how much will it cost the consumer just in materials to re-mulch the area (round to the nearest dollar)?

Let f of x equals the integral from 1 to 3 times x of the natural logarithm of t squared. use your calculator to find f″(1).