I think the answer is 3cm I’m not 100% sure
Step-by-step explanation:
area of rectangle=length×breadth=(2x+3)(3x+7)
=6x²+9x+14x+21=6x²+23x+21

I think this is what you want? When multiplying with exponents, you either add or multiply the exponents.
When you multiply the exponent:
(x²)³ = 
= 9
When you add the exponents:
(x²)(x³) = 
(x²)(x²) = 

Answer:
3150.0
Step-by-step explanation:
You move the decimal point 3 places to the right because the exponent is a positive 3.
I want to say the slope of AC will be 0