99.7% of 7-year-old children are tall.

99.7% of 7-year-old children are between 3.8 ft and 4.1 ft = 45.6 inches and 49.2 inches

Step-by-step explanation:

The 99.7% of 7 year old children are usually between the height of 3.8 feet and 4.1 feet. That is, between 45.6 to 49.2 inches tall.

To convert feet to inches, multiply the length in feet by 12.0.

So, 3.8 feet to inches in formula = 3.8 x 12.0.

Thus, for 3.8 feet in inches = 3.8 ft x 12.0 = 45.6 inches

                                                 1           1ft

And 4.1 feet in inches      = 4.1ft  x 12.0   = 49.2 inches

                                              1          1ft

There is no much difference in the heights of the 7-year-old boys and girls.

answer: c.  

step-by-step explanation:

mixtures containing substances that get attracted to magnet can be separated using a magnet. we can separate iron from a mixture of sand and iron, as only iron attracts to the magnet.

answer: two angles are called supplementary if they add up to 180°. example: the two angles (140° and 40°) are supplementary because they add up to 180°.

step-by-step explanation: