What is 2 (2.5b-9) + 6b=-7 in solving multi step equations

A ship anchored in a port has a ladder which hangs over the side. The length of the ladder is 200cm, the distance between each rung in 20cm and the bottom rung touches the water. The tide rises at a rate of 10cm an hour.

Give an example of two fractions whose sum can be simplified to 1/2

5 5/8 - 3 2/8 is equal to 2 3/8. True or False?

Solve 5x^2-4x-2=0 by completing the square

Which transformation will always map a parallelogram onto itself

Norma received one penny on first day of the month and each day after that she received triple number of pennies

Round-trip bus fare is $2. Justin rides the bus 5 days a weeks to work and 2 nights a week to school. He can buy a pass at school that allows 6 months of unlimited bus rides for $400.

Suppose that the number of inhabitants of country a is given by y=-7.24x+937.69 million, and the number of inhabitants of country b is given y=2.16x+834.29 million, where x is the number of years since 1960.

What is the sum of the geometric sequence 1, 3, 9, if there are 11 terms?

What is the volume of a sphere if the radius is six