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So would it be Mn^7+?

One isotope of a metallic element has mass number 55 and 30 neutrons in the nucleus. The cation derived from the isotope has 18 electrons. Write the symbol for this cation

Vanillin (used to flavor vanilla ice cream and other foods) is the substance whose aroma the human nose detects in the smallest amount. The threshold limit is 2.0 10-11 g per liter of air. If the...

A farmer has 1,200 acres of land on which he grows corn, wheat, and soybeans. It costs $45 per acre to grow corn, $60 for wheat, and $50 for soybeans. Because of market demand he will grow twice as...

A rectangle is inscribed in a semicirlce with a radius of 50. Find a function that models the area A of the rectangle in terms of it's height.

If someone can help me step by step I would greatly...

I was trying to make a function from the following word problem.

Grain is falling from a chute onto the ground forming a conical pile whose diameter is always three times it's height. How high...