Simplify:

1: (-12xy2z)(3xy)

2: -12xy2z divided by 3xy

3: 2x(2x - 5)

4: -2x(2x-5)

multiplying: exponents add

dividing: exponents subtract.

1)(-12xy2z)(3xy)
-12*3 ( x1+1 y2+1 z1 )
-36 x2y3z1

I'm still confused

Sure, I can help you with that. Let's simplify each expression step by step:

1. (-12xy^2z)(3xy)
To simplify this expression, we can multiply the coefficients (numbers) and combine the variables with the same base raised to the same power.
-12 * 3 = -36
x * x = x^2
y^2 * y = y^(2 + 1) = y^3
z * no z = z
Therefore, the simplified expression is -36x^3y^3z.

2. -12xy^2z divided by 3xy
To divide these two expressions, we can cancel out the common factors in the numerator and denominator. In this case, we can cancel out 3, x, and y.
-12 / 3 = -4
x / x = 1
y^2 / y = y^(2 - 1) = y
Therefore, the simplified expression is -4yz.

3. 2x(2x - 5)
To simplify this expression, we can use the distributive property of multiplication over addition/subtraction. Multiply each term inside the parentheses by 2x:
2x * 2x = 4x^2
2x * -5 = -10x
Therefore, the simplified expression is 4x^2 - 10x.

4. -2x(2x - 5)
Similar to the previous expression, we'll use the distributive property to simplify this one:
-2x * 2x = -4x^2
-2x * -5 = 10x
Therefore, the simplified expression is -4x^2 + 10x.

I hope this helps! Let me know if you have any other questions.