Isabel wrote 11 letters to friends each month for x months in a row. write an expression to show the total number of letters Isabel wrote

Astuntman jumping off a 20-m-high building is modeled by the equation h=20-5t^2, where t is the same in seconds. a high-speed camera is ready to film him between 15m and 10m above the ground. for which interval of time should the camera film him?

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

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.