25 points!
i don't need an answer, just an explanation of how to do it. )

1st Apply rule -(-a) = a

    1 + 3

2nd Add the numbers: 1+3=4

Hope I helped you out :)

See below.

Step-by-step explanation:

2 adjacent negatives like we have here simplify to a +.

1 - (-3)

= 1 + 3

= 4.

The product of 2 negative values is always a positive for example:

-2 * -3 = 6.

We can look upon -1(-3) as a product of -1 and - 3 , giving +3.

expression #3 is not equivalent. the others are.

infinitely many solutions

step-by-step explanation:

we have been given the equation;

2(2x + 3) = -4 + 2(2x + 5)

we need to determine the value of x.

2(2x + 3), we expand this expression to obtain 4x + 6

similarly 2(2x + 5) will become 4x + 10

now we have;

4x + 6 = -4 + 4x + 10

4x + 6 = 4x + 10 - 4

4x + 6 = 4x + 6

the expression on the left hand side is identical to the one on the right hand side. therefore, we are looking at just a single straight line whose equation is;

y = 4x + 6

consequently, we shall have infinitely many solutions