Write as an algebra expression

a% of 80

a% of 80 is

80(a/100)

To convert percentages to decimals, divide the number by 100. Thus we divide a by 100.

To find the percentage of a number, multiply its decimal form by the number, thus we multiply 80 by that decimal.

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.