Answer:
what do you mean for this question. What do you need help on?
Given:
The figure of a right triangle. 
and perpendicular = 12.
To find:
The measure of angle y.
Solution:
In a right angle triangle,
In the given right angle triangle,
Therefore, the measure of angle y is 
.
Answer:
n=40
Step-by-step explanation:
Answer:
133
Step-by-step explanation:
38/2=19
1 hour = 19 clean windows
7 hours *19 =133
Answer:
120 4-digit numbers.
Step-by-step explanation:
For the numbers to be divisible by 5 they must end in 5.
So the total number of first 3 digits of the 4-digit number are given by the
number of permutations of 3 from the numbers 1,2,3,4,6 and 7 (6 digits)
= 6P3
= 6! / (6-3)!
= 6*5*4
= 120.
