1)Rút gọn: (√9+4√5)-(√9-4√5)-√5+(√23-8√7)
2)Chứng minh:
x²+x√3+1 luôn luôn dương với mọi x.

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

State if the two triangles are congruent. if they are, state how you know?

Aliter of water contains about 3.35 x 10^25 molecules. a certain river discharges about 2.9x 10^8 l of water every second. about how many molecules does the river discharge every minute? write your answer in scientific notation