Cho tam giác ABC vuông tại B, có AB =5cm, BC=12cm .Trên tia đối của BA lấy điểm D sao cho BA=BD, trên cạnh BC lấy điểm E sao cho BE=4cm. a) Tính độ dài cạnh BC b) Chứng minh tam giác EAD cân c) Tia AE cắt DC tại K . Chứng minh K là trung điểm của DC d) Chứng minh AD<4EK

Suppose that f(0) = −3 and f '(x) ≤ 8 for all values of x. how large can f(4) possibly be? solution we are given that f is differentiable (and therefore continuous) everywhere. in particular, we can apply the mean value theorem on the interval [0, 4] . there exists a number c such that

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan bought 4 bottles of water and 1 cup of coffee for his family for 7.15. how much does each bottle of water cost? how much does each cup of coffee cost?

Which expression is equivalent to -5(3x - 6/7)