5
Step-by-step explanation:
AB=CD (Opposite sides of a parallelogram are equal)
11x-13=42
11x=42+13
11x=55
x=55/11
x=5
Answer:
B ------- DE ≅ RS
it's B because DE and RS both contain the equal angles.
Answer:
128 degrees because it is a suplimentary angle which adds up to be 180...so you subtract 180-52 and you get 128
Answer:
32
Step-by-step explanation:
Add up all the numbers and then divide by how many numbers there are.
Answer:
40/9
Step-by-step explanation:
Use the work formula, 
+ 
= 
, where A is the amount of time it takes one person, B is the amount of time it takes another person, and T is the time it takes for them to work together.
Plug in the times for David and Alex alone:
+ 
=
Find the least common denominator, which is 40.
+ 
=
=
Cross multiply and solve for T:
9T = 40
T = 40/9
So, if they worked together, it would take them 40/9 hours
