Cho tam giác ABC vuông tại A. vẽ đường cao AH (H thuộc BC) a) CHứng minh tam giác BHA tương đươn với tam giác AHC
b) Chứng minh AB^2 = BC. BH
c) Tia phân giác của góc HAC cắt BC tại D. Qua D kẻ đường thẳng vuông góc với AD. Đường thẳng này cắt AB ở E. Chứng minh AB = BE

all group life insurance is term insurance. actually it is annual renewable term and it is rated on the average age and claims experience of the entire group, which is called "experience rating." remember, this type of insurance has a 31-day grace period and is convertible to whole life upon leaving employment. a contributory group plan requires that both the employer and the employees pay part of the premium. at least 75% of those eligible must participate, so the group is sure to get most of the healthy employees as well as those that are sick.

step-by-step explanation:

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.

ratio is 2 : 9

the answer is three

13.5 : 3