Answer: x=4
Step-by-step explanation:
similar triangle so corresponding parts are similar

cross multiply
70 = 20x-10
80 = 20x
x = 4
Answer:
5
Step-by-step explanation:
The geometric mean of 2 numbers a and b is

Hence
The geometric mean of 5 and 10 is

= 
=
=
×
= 5
Answer:
the sum of the other two angle is 93
Step-by-step explanation:
180-87=93
Answer:
2/13 of an hour
Step-by-step explanation: