Can somebody help me please ​

*segment an is an altitude of right ? abc with a right angle at a. if ab = 2root 5 in and nc = 1 in, find bn, an, ac.

Tim has obtained a 3/27 balloon mortgage. after the initial period, he decided to refinance the balloon payment with a new 30-year mortgage. how many years will he be paying for his mortgage in total?

Carly made a beaded necklace. 4/18 of the beads are blue and 1/3 of the beads are green. use benchmark fractions to estimate about what fraction of the beads in the necklace are blue or green. explain