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what is the area of this triangle?

a) a= 1/2(y^3-y^2)(x^3-x^1)

b) a= 1/2(y^3-y^1)(x^3-x^1)

c) a= 1/2(y^3-y^1)(x^2-x^1)

d) a= 1/2(y^2-y^1)(x^3-x^1)

e) a= 1/2(y^2-y^1)(x^2-x^1)

Scarlet bought three pairs of sunglasses and two shirts for $81 and paula bought one pair of sunglasses and five shirts for $105 what is the cost of one pair of sunglasses and one shirt?

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50. write an inequality to determine the number of chores, c, janie could do to have enough money to buy the cd.

Emily is entering a bicycle race for charity. her mother pledges $0.90 for every 0.75 mile she bikes. if emily bikes 18 miles, how much will her mother donate?