Determine the missing number 420 + = 670 basically 420 + what = 670 so what equals 670 but has to include 420 P. S please note this is 5th grade please don't put all of this x=y i just need a 5th grade explanation

The answer is 250.

Step-by-step explanation:

Hello! This is a simple subtraction matter. All order-of-operations are opposites (multiplication and division, and addition and subtraction.) This means that since we're presented with a case where 420 + something = 670, the opposite is 670 - 420 = something.

If we compute some simple calculations, 670 - 420 = 250.

There's your answer :)

there are many solutions.

step-by-step explanation:

step 1: simplify both sides of the equation.

4x+6=4x^2+10x−4

step 2: subtract 4x^2+10x-4 from both sides.

4x+6−(4x^2+10x−4)=4x^2+10x−4−(4x^2+10x−4)

−4x^2−6x+10=0

step 3: factor left side of equation.

−2(2x+5)(x−1)=0

step 4: set factors equal to 0.

x=-5/2 or x=1