Answer:
2
x
Step-by-step explanation:
The diagonal divides the square into 2 right angles with legs s and hypotenuse x
Using Pythagoras' identity on one of the right triangles, then
s² + s² = x²
2s² = x² ( divide both sides by 2 )
s² =
( take the square root of both sides )
s =
= 
Thus
perimeter = 4s = 4 ×
= 
Multiply numerator/ denominator by 
perimeter =
= 2
x
Answer:
Teacher's age is 32.
Step-by-step explanation:
How you count the average age for people is:
(age of person 1 + age of person 2 ... ) / number of people = average age
Let's start by observing that we've got 2 equations coming from the text:
- average of just students
20 students x 11 (average for a student) = sum of age of students
20 x 11 = 220 - average of student and teacher
let's say x is age of teacher
together students & teacher is 20 + 1 = 21 people
(20 students x 11 + x)/ (20 + 1) = 12
(220 + x) / 21 = 12
220 + x = 12 * 21
x = 12 *21 - 220
x = 252 - 220
x = 32
hope this helps ❣️
Answer:
x=9, y=14
Step-by-step explanation:
2x+27+2x+27=90
4x+54=90
4x=36
x=9
4y-19 = y+23
3y= 42
y=14
8 over 10 times by 100, and 11 over 15 times by 100 to find in percentage. Whichever number is bigger is your answer.