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Questions in Grade Middle-school

[Done] Al washed a car in 6 minutes. Fred washes the same car in 8 minutes. How long does it take Al and Fred to wash the car together?

[Done] What is the least common denominator for the fractions [tex]\frac{5}{6}[/tex] and [tex]\frac{3}{8}[/tex]? What is the least common denominator for the fractions [tex]\frac{3}{4}[/tex] and [tex]\frac{6}{7}[/tex]?

[Done] How do you write "6 more than 7 times a number is 41" as an algebraic equation?

[Done] Hello, I need help please for mission 3 thank you very much.

[Done] What is the perimeter of a square with an area of 81 cm²?

[Done] What number is equivalent to \(\frac{13}{2}\)?

[Done] Simplify the expression: \[ \frac{1}{x} + \frac{1}{x+h} \]

[Done] Where will you find the maximum rate of evaporation: ocean, pond, or aquarium? Give a reason to support your answer.

[Done] If the length of each side of a square prism is ten feet, find the total surface area of the object.

[Done] In a parallelogram, one angle is 9 times the size of another. Find the measures of the angles.