The scale factor of two similar swimming pools is 4: 7. the amount of a chlorine mixture to be added is proportional to the volume of water in the pool. if 3 cups of the chlorine mixture are needed for the smaller pool, how much of the chlorine mixture is needed for the larger pool?

It would require 5.25 cups.

Since the amount of chlorine mixture necessary is proportional to the volume of water in the pool, we will use the scale factor of the volume of the two pools, 4/7, to set up a proportion.

4/7 = 3/x

Cross multiply:
4*x = 3*7
4x = 21

Divide both sides by 4:
4x/4 = 21/4
x = 5.25

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 )