Cho tam giác ABC vuông tại A,đường cao AH=6 cm. HC=8 cm a) Tính độ dài HB. BC. AB. AC
b) Kẻ HD vuông góc AC (D thuộc AC) .Tính độ dài HD và diện tích tam giác AHD

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

Create a question with this scenario you could ask that could be answered only by graphing or using logarithm. david estimated he had about 20 fish in his pond. a year later, there were about 1.5 times as many fish. the year after that, the number of fish increased by a factor of 1.5 again. the number of fish is modeled by f(x)=20(1.5)^x.

Write the summation to estimate the area under the curve y = 1 + x2 from x = -1 to x = 2 using 3 rectangles and right endpoints