Cho tam giác ABC vuông tại A, có AB = 5, AC=7. Kẻ đường cao AH. Hãy tính AH, BH, CH

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

Which expressions are equivalent to k/2 choose 2 answers: a k-2 b 2/k c 1/2k d k/2 e k+k

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling