The voltage across the speaker is 5 volts. the voltage across the speaker is increased to 15 volts in order to increase the sound level what is the decibel gain

David bought a poster for an art project. the poster is 2.7 feet wide and 3.9 feet tall. what is the area of the poster?

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

Ametal rod needs to be 9 feet and 5.5 inches in length. the sections of the poles being used are each 1 foot and 10.5 inches long. how many 1ft 10.5in sections would be needed to complete the 9ft 5.5in metal rod? and how many inches of material will be left?