Solve each system by elimination

-9x - 4y=2

7x + 4y = - 6

The mean of twelve positive numbers is 3. When another number is added, the mean becomes 5. Find the thirteenth number.

A map has a scale of 1 cm to 3.2 km. The real-life distance between two towns is 64 km. What is the distance between the two towns on the map?

If you spend 7 hours a day sleeping what fraction of the day are you asleep?

Let x be a random variable that represents hemoglobin count (hc) in grams per 100 milliliters of whole blood. then x has a distribution that is approximately normal, with population mean of about 14 for healthy adult women.

Dan has $3.75. If he spends 1/3 of his money, how much will he have left? A. $1.25 B. $2.50 C. $7.50 D. $11.25

How to do angles like vertical and congruent

Which is longer, 4000 ft or 1 kilogram?

Mikey worked 8 hours on Wednesday, 6 hours on Thursday, and 7 hours on Friday. His gross pay for all three days was $187.95 A. $8.95 B. $8.98 C. $28.13 D. 65.63

Ray cupple bought a basic car costing 26,500, with options costing 725.00. There is a 6% sales rax in his state and a combined 50.00 license and registration fee. What was ray's total cost

theater technician charges a $200 flat fee and 5% of all profits from ticket sales per show. If the technician made $400.00 on a show, how much total profit was there from ticket sales?