The sum of 23.456 90.354 and 345.1

458.910

Step-by-step explanation:

To calculate the sum, we need to add each of the numbers in order

1.       23.456

      + 90.354

          113.810

Then we add the next number to the above total, (to understand better, 345.1 is the same as 345.100-This is to make the two numbers have the same decimal places

2.        113.810

       + 345.100

          458.910

207/8 is the right

a) y = -3x +2

b) y = 1/2x -6

these 2 can be combined into one equation.

-3x +2 = .5x -6

8 = 3.5x

x = 8 / 3.5 = 2.2857142857

y = -3 * (8 / 3.5) +2

y = (-24 / 3.5) + 2

y = -4.8571428571

step-by-step explanation: