8a+4s=840
a=s+30
8(s+30)+4s=840
12s+240=840
12s=600
s=50
A=s+30
a=50+30
a=80
The drama play sold 80 adult tickets
Answer:
The answer is 4/9
Step-by-step explanation:
Hi. Here's the work.
First turn everything into an improper fraction.
÷
=
÷ 
To divide fractions we multiply by the flipped version of the fraction, or the reciprocal.
÷
= 
Now we just multiply the fractions!
= 
The answer is therefore 4/9. Please mark brainliest if possible and i hope you get a good grade on your homework. ;)
Answer:
Measure the distance of treads (Exclude the width of nosing). If all the treads are uniform in size, measure one tread otherwise you will need to measure all treads. ...
Measure the height of risers. ...
Divide the riser height by the tread width and then calculate the inverse tangent.
15.66 is what I got in my calculator if you turn %65 into .65