Under a contract with valley vineyard, walsh begins grading a terraced hillside for the planting of grapes. halfway through the project, walsh asks for $5,000 over the contract price, claiming an increase in the "cost of doing business."

valley agrees but later refuses to pay. valley's agreement to pay more is :

a. unenforceable because walsh's performance was a preexisting duty.

b. unenforceable because valley's promise was illusory.

c. enforceable.

d. unenforceable because walsh's request modified the contract.

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; i believe the correct answer is (form utility); good luck

answer; im thinking customer:

i would say iii (3) because in order to compare a price you have to use as a reference other near stores because it's its

hope i explained myself