Melissa writes checks to pay for her rent, utilities, and groceries, and she keeps a record of all these transactions in her check register. Keeping an accurate check register helps Melissa

Helps her keep track of where her money is going

Explanation:

One of the best way to keep record of expenditures is by tracking and placing carefully their transaction details and record. This helps in the area of accountability. Melissa does this to keep track of where her money is going so she can save and manage her resource properly.

bd = 9 cm

step-by-step explanation:

in a 30°-60°-90° triangle, the ratio of side lengths is 1 : √3 : 2. that is, the longest side (hypotenuse) is twice the length of the shortest side.

all of the triangles in your geometry are 30°-60°-90° triangles. ac is the hypotenuse of δacd, and the short side of δabc.

the short side ad of δacd will be half the length of ac, so 3 cm. the hypotenuse ab of δabc will be twice the length of ac, so 12 cm. segment bd is the difference of the lengths ab and ad, so is

bd = ab -ad

bd = 12 cm - 3 cm = 9 cm

comment on side length ratios

you can figure the ratios of side lengths in a 30°-60°-90° triangle by considering the trig ratios of the angles. or you can figure the length of the altitude of an equilateral triangle of side length 2 using the pythagorean theorem.

answer/// there is an inverse relationship between price and quantity demanded;