Help pls step by step

this is the problem you had to find the SIMPLIFYING EXPRESSIONS

this is the problem 7x - 2(x + 5) =

20 points!!!

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)

Which statements about these triangles is true

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?