Emergency! if a = 1, find the values of b, c, and d that make the given expression equivalent to the expression below. expression given: (3x^(2)+2x-21)/(-2x^(2)-2x+12)*(2x^ (3)+25x+63)/(6x^(2)+7x-49) expression that need to equal to the given one: (ax + b) / (cx + d) a= 1

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.