A (n) ___

is a letter used as a placeholder for an unknown value.

What is the standard form of 30 + 5 + 2/10

4x-3y=-40 9x+5y=4 x=? y=? How do I do this?

What is the domain of the function f / circ g where f (y) = / frac{4}{y-2} and g (x) = / frac{5}{3x-1}? Express it in terms of a union of intervals of real numbers.

Elaine is in the business of repairing home computers. She charges a base fee of $50 for each visit and $25 per hour for her labor. Write the function that represent the situation. And find how much it the charges be for 5 hours.

Sean and Kyle have 26 dollars between them. If Sean has 8 more dollars than Kyle, how much money does Kyle have, in dollars? A. 18 B. - 4 C. 20 D. 9

The population of the United States is 3 * 10^8 people, and the population of the world is 6.9 * 10^9 people. How many times larger is the world population? Write your answer in standard notation.

Which of the numbers are divisible by 9 119 702 432 641 372

A restaurant used 8 5/6 pounds of rice on Monday and 5 1/6 pounds of rice on Tuesday. How many more poundsof rice was used on Monday than on Tuesday?

How long will it take an emperor penguin to swim 14 miles if it is swimming 7 mph?

What's worse than finding a worm in an apple?