. HELP ME PLEASE

Use only mathematical concepts, prove the following a valid formula.
O = *square root of O squared*
Be sure to use the method of L. H.S. and R. H.S. to ensure you get full marks.
Why do we need to calculate standard deviation if it is simply the square root of the
variance?

hi,

3. 12.15, you are correct.

4.2.01, your first digit is correct,

hope this !

2. angles qrt and qst both measures 156 degrees.

step-by-step explanation:  

we have been given a diagram of a circle and we are told that measure of arc qvt is 156 degrees.  

we can see from our given diagram that angle qrt and angle qst subtends to arc qvt.

since we know that angles subtended by the same arc at the circumference are always equal.

by angle subtended by same arc theorem, measure of angle qrt and angle qst will be equal to the measure of arc qvt.

therefore, angles qrt and qst both measures 156 degrees and 2nd statement is the correct choice.

answer: im gonna go with milli

step-by-step explanation: