Solve the equation for the indicated variable. \frac{a + 5}{b} = \frac{a – 5}{b} + \frac{b + 5}{a}; for a

If 2x – 3y = 11 and 3x + 15 = 0, what is the value of y?

Solve the following system of equations. -5x – 4y = -9; -9x – 2y = 15.

A pharmaceutical salesperson receives a monthly salary of 2500 dollars plus a commission of 7% of sales. Write a linear equation for the salesperson’s monthly wage W in terms of monthly sales S.

Jake’s pretzel stand sells three times as many pretzels as Lisa’s stand. The difference between their sales is 400 pretzels. How many pretzels did Jake sell?

In printing an article of 48,000 words, a printer decides to use two sizes of type. Using the larger type, a printed page contains 1,800 words. Using a smaller type, a page contains 2,400 words. The article is allotted 21 full pages in a magazine. How man

How much concentrated 18 M sulfuric acid is needed to prepare 250 mL of a 6.0 M solution?

A mixture of 16% disinfectant solution is to be made from 14% and 22% disinfectant solutions. How much of each solution should be used if 16 gallons of the 16% solution are needed? There needs to be gallons of 14% solution and gallons of 22%.

Tris-Borate-EDTA, or TBE, is commonly made as a 5x solution. What volumes of 5x TBE and water are required to make 500 ml of a 0.5x solution, which is often used in electrophoresis?

Detail how to dilute a stock solution of nitric acid, 81 m HNO3, to prepare 675 mL of a 2.5 M solution.

How many solutions does the equation 2x – 6 = 6 + 2x have?

The bookstore at SunTan U had a sale on school t-shirts. Thursday, they sold 52 of the marked down t-shirts for a total of $482.50. If the women’s shirts were on sale for $9.50 and the men’s shirts were on sale for $9.00, how many of each was sold on Thur

Find the roots, x_1 and x_2, of x2 – 5x -14 = 0.

How many mL of 3% aqueous hydrogen peroxide solution can you make out of 100 mL of 35% aqueous hydrogen peroxide?

A chemical manufacturer wants to lease a fleet of 25 railroad tank cars with a combined carrying capacity of 420,000 gallons. Tank cars with three different carrying capacities are available: 6,000 ga

Solve for y: 4x – 3y = 7

A party rental company has chairs and tables for rent. The total cost to rent 3 chairs and 5 tables are $40. The total cost to rent 12 chairs and 2 tables are $43. What are the cost to rent each chair and each table?

At the city museum, child admission is $5.70 and adult admission is $9.20 . on tuesday, 160 tickets were sold for a total sales of $1171.00. How many child tickets were sold that day?

A coffee manufacturer uses Colombian and Brazilian coffee beans to produce two blends, robust and mild. A pound of the robust blend requires 12 ounces of Colombian beans and 4 ounces of Brazilian beans A pound of the mild blend requires 6 ounces of Colomb

How to prepare 1 ml of GTE buffer (50mM glucose,25mM Tris Hcl PH 8.0,10mM EDTA) for the plasmid isolation from the given stock solutions (2Mm Tris-Hcl ,0.5mM EDTA,1M glucose)?

How do you solve for r in 9/4 = (r – 10) / r?