I) A book has a length 20cm breadth 13cm and a height of 1.5cm Find the volume of 7 such books piled together.
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6300 cm^3

Step-by-step explanation:

the volume of one book = 20 × 13 × 1.5 = 900 cm^3

the volume of seven books = 900 × 7 = 6300 cm^3

So, the answer is 6300 cm^3.

828. all there is to it!

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answer:   28.56 feet (approx)

step-by-step explanation:

since, triangle abc has measure of angle c equal to 55 degrees, measure of angle abc equal to 90 degrees, and length of bc equal to 20 feet.

we have to find out the measurement of segment ab.

therefore, tan 55° =

but bc = 20 feet.

⇒ tan 55 ° =  

⇒ ab = 20 × tan 55 °

⇒ ab = 20 × 1.42814800674

⇒ ab = 28.5629601348   ≈ 28.56 feet