A model of a skyscraper was made by an architect. The model was 10 in. high. If the architect used a scale of 2 inches represents 12 feet, what would be the actual height of the building? 12 ft

240 ft

120 ft

60 ft

60 ft

Step-by-step explanation:

2 : 12 = 10 : x

120 : 2 = 60

a4 - 3a2 - 1

step-by-step explanation:

step   1   :

equation at the end of step   1   :

  ((a4) -   3a2) -   1

step   2   :

trying to factor by splitting the middle term

2.1     factoring   a4-3a2-1  

the first term is,   a4   its coefficient is   1 .

the middle term is,   -3a2   its coefficient is   -3 .

the last term, "the constant", is   -1