Donna reads a book at a rate of 20 chapters per hour.

Mathematics

2 answers:

mart [117]2 years ago

8 0

Answer:

20/1=20 1 hour read one book

Step-by-step explanation:

4 chapter read in 4 hour because 1 chapter read in one gour

Studentka2010 [4]2 years ago

5 0

Answer:

Step-by-step explanation:

When working with rates, multiplication is very useful. Rate questions will give a specific rate and then a time period. They often ask, based on the rate, what can be achieved in the given time period.

The question says that if Donna can read 20 chapters in 1 hour, how many chapters can she read in 4 hours. To solve this, you can multiply 20*4; this will show how many chapters she reads in the given time period.

Since 20*4=80, she must read 80 chapters in 4 hours.

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The surface area of the triangular prism pictured below is 204 square centimeters. What is the height of the prism?

Fudgin [204]

The picture in the attached figure

we know that
surface area=2*area of the base+perimeter*height

area of the base=area of the triangle
area of the base=3*4/2----> 6 cm²

perimeter of the base=perimeter of triangle
perimeter=3+4+5----> 12 cm
height=x cm

surface area=2*6+12*x
surface area=204 cm²
12+12*x=204
12*x=204-12
12*x=192
x=192/12
x=16 cm

the answer is
16 cm