Question

How do i solve –1.8c + 5.1d for c = 2.9 and d = -4.2.

Answer 1

See below

Explanation:

-1.8c + 5.1d plug the numbers in that you were given.

-1.8(2.9) + 5.1(-4.2)

Multiply the first and second group of numbers

-1.8 x 2.9 = - 5.22

5.1 x -4.2 = - 21.42

Now add the two numbers together but remember they are both negative numbers. So when you add them together, it will end up being a more negative number.

-5.22 + -21.42 = - 26.64