2. Use the quadratic formula to solve the equation. Give the exact answer. Simplify fractions and radicals when possible.
2x2 + 6x-4 = -5

Find the solution of system of equation y= x-4 y=4x+2

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

Billie holiday sells children's clothing for sara vaughn's toddler shop. baby blankets sell for $29.99 after a markup rate based on cost of 109%. find the cost and the markup.