I have 7000$ invested in annuity, part at a yearly rate of 9% and part at a yearly rate of 11%. The total interest earned for one year is $654. How much was invested at each rate?

What could explain what happened when the time was equal to 120 minutes

Average acceleration: i have no idea how to do this.

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.