What is the answer for number 9 and 10

A=6 and B=1.

A=You divide 480 by 80 and get 6

B=You divide 30 by 30 and get 1

Hope this helps! 

9.) we need to find what a equals right? for this equation.
a x 80 = 480 
in order to isolate a to be alone we would have to do the opposite what the 80 is doing (multiplying) so we are going to divide 80 by 480 to get what our answer equals. here is the math.
480/80 = 6 
so your answer i
a = 6 

10.) this equation is easyyy trust me lets solve it 
b x 30 = 30 
what times 30 would equal 30? 
1 is the answer! because imagine if you were making those rows for multiplication. you have 30 circles all in one line!
so b = 1
BRAINLIEST ANSWER!!
have a good one:)

merry christmas

Answer: d. 39 cmin the diagram, the approximate length of the minor arc de is 39 centimetres.step-by-step explanation: the formula for the length of an arc in a circle is as displayed below.let the length of the minor arc de = xx = 2( pi )r × angle of sector / 360°from this, we will substitute the values given from the problem into the formula to obtain the length of the minor arc de.x = 2( pi )r × angle of sector / 360°r = radius = 25cmpi as an approximate value = 3.14angle of sector = 120°x = 2( 3.14 )( 25 ) × 120° / 360°x = 157 × 1 / 4x = 39.25x = 39 ( rounded to the nearest whole number as an approximate value )