Prove part 2: If the diagonals of a trapezoid are congruent, then the trapezoid is isosceles. Given: ABCD is a trapezoid with line BC ∥ line AD and diagonals line AC ≅ line DB . Prove: ABCD is an isosceles trapezoid.

Which of the following contains a variable?

Credit card a offers an introductory apr of 3.4% for the first three months and standard apr of 15.7% thereafter,

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of