For this problem, you would replace x with 7 then solve.
3/ (7+2) - sqrt(7-3) =
3/9 - sqrt(4) =
1/3 - 2 = -1 2/3 = -1.67
f(7) = 1
The number of ways to choose the colors is 36
<h3>How to determine the number of ways?</h3>
The given parameters are:
Colors = 9
Colors to choose = 7
Since order does not matter, then it is combination
This is calculated using:

This gives

Evaluate

Hence, the number of ways is 36
Read more about combination at:
brainly.com/question/11732255
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The sibling cab either be male or female.
so, the required probability is 1/2
Make a proportion.
Do base over height;

.

h is the height of the second triangle. Solve for h.
Cross multiply.
6h = 168
h = 28
The height of the second triangle is 28 cm.