Solve the proportion. Round your answer to one decimal point and type just the numeric value below. 

 Insert a geometric mean between 3 and 12. 

Use the quadratic formula to solve for x :  2×2 + 10x – 28 = 0

Insert a geometric mean between 6 and 24. 

Subdivide a line segment of length 140 cm into the ratio of 3:7. State both the short and the long lengths.

Suppose a floor plan has a length of 38 ft. Using Alberti’s recommendations, find the width of the floor plan, using the octave doubled. Round to one decimal place if necessary and enter just the numeric value below.

Suppose a floor plan has a length of 15 ft. Using Alberti’s recommendations, find the width of the floor plan, using the fifth ratio. Round to one decimal place and type just the numeric value below.  

Determine whether the following progression is arithmetic, geometric, harmonic, or none of the above. If arithmetic or harmonic, find the common difference, d. If geometric, find the common ratio, r. 1, 2, 4, 7, 11, …  

Solve the proportion. Round your answer to one decimal point and type just the numeric value below.   

The Africans brought all of the following from their culture to the Americas except: