Which computation could be used to find the area of the front cover of this notebook?

a. add 15 and 15 and 10 and 10

b. add 15 and 10

c. add 15 and 10 and multiply the answer by 2

d. multiply 15 by 10

The answer is D. 

To get an area of any 4 sided object (like you text book) , we multiply the length and the width.

All the other answers don't multiply only 2 numbers together, so we know it must be D)

Answer: d. 39 cmin the diagram, the approximate length of the minor arc de is 39 centimetres.step-by-step explanation: the formula for the length of an arc in a circle is as displayed below.let the length of the minor arc de = xx = 2( pi )r × angle of sector / 360°from this, we will substitute the values given from the problem into the formula to obtain the length of the minor arc de.x = 2( pi )r × angle of sector / 360°r = radius = 25cmpi as an approximate value = 3.14angle of sector = 120°x = 2( 3.14 )( 25 ) × 120° / 360°x = 157 × 1 / 4x = 39.25x = 39 ( rounded to the nearest whole number as an approximate value )

Ibelieve the answer is b. y=0 would make the line horizontal across the x.