The equations (-75)(-49)=3,675 the answer
B. (k+10f)(k-5f) you can tell in 2 ways. 1. if the second sign is neg then the signs in the factors are going to be one neg and one positive so that knocks out C and D. Then you look at the second term and since the 5 is positive then the 10 has to be positive so you end up with a positive 5kf.
The second way is to FOIL them out. When you check B you get

combine your like terms and you have your original expression of

Hope that helps
This question is not understandable. Can you rewrite it again please?
Answer:
all it is is L*w*h
Step-by-step explanation:
how to solf A) is 5*4*10 thats it and the same for b-d
Answer:
2;4;3
Step-by-step explanation:
y=2x²+4x+3