The radius of a fluorine atom is about 5 x 10^-8 millimeter. The radius of a strontium atom is about 2 x 10^-7 millimeter.
About how many times larger is the radius of a strontium atom than the radius of a fluorine atom?

-3/20000000

Step-by-step explanation: I just subtracted the 2

b i think

step-by-step explanation:

not really sure

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.