How to find mean and standard deviation given mean and standard deviation of each variable?

what does the word range mean

The perimeter of a living room with 68 feet if the length of the living room is 18 feet what is the width

The water slide is 130 meters from the top to bottom. The vertical height of the slide is 50 meters. What is the angle of elevation of the slide?

Write two operations in order that you would use to solve the equation 3x - 2=7 then solve the equation

Factorization x^2+2x+5

Joseph sees 4 2/3 doughnuts sitting on a table. Unable to restrain himself, he gobbles down 3/4 of the 4 2/3 doughnuts. How many doughnuts does he eat?

You earned $204 from your job last week. You have two relatives with birthdays coming up and you want to spend the same amount on each of them. You want to still have $80 left over. How much do you spend on each gift?

What is the axis of symmetry for the parabola with the equation y=2x^2

Cost of 10 oranges is one dollar what is the cost of five

Multiply the polynomials: (2x^3-4x) (3x^2+2) 6x^5-16x^3+8x x^5+18x^3-6x 5x^6+11x^3+8x 6x^5-8x^3-8x