What is cos 30+cos 70

The isosceles triangle has two sides of equal length, a, that sre longer than the length of the base ,b. the equation 2a+b=15.7 can be used to find the sides length. if one of the longer sides is 6.3 centimeters what is the length of the base

Which expression is equivalent to 2x^2+7x+4?

Enter the number of complex zeros for the polynomial function f(x) = x 4+ 5x² +6