Answer:
Step-by-step explanation:
Given that:
To evaluate the expression, we must simply substitute the given value of 
, which is 
, for :
Multiply:
Subtract:
-
To check your work, simply set the given expression equal to our solution, :
Add 
to both sides of the equation:
Divide both sides of the equation by the coefficient of , which is 
:
Since it matches the given value of , our solution is correct!
If this is a true or false question, than this is true.
Answer:
A = 450 cm²
Step-by-step explanation:
Since the right triangle is isosceles then the 2 logs are congruent , both 30 cm and at right angles to each other.
The area (A ) of the triangle is calculated as
A = 
bh ( b is the base and h the perpendicular height )
Here b = h = 30 , then
A = × 30 × 30 = × 900 = 450 cm²
Check whether the two expressions 2x+3y2x+3y and 2y+3x2y+3x equivalent.
The first expression is the sum of 2x2x 's and 3y3y 's whereas the second one is the sum of 3x3x 's and 2y2y 's.
Let us evaluate the expressions for some values of xx and yy . Take x=0x=0 and y=1y=1 .
2(0)+3(1)=0+3=32(1)+3(0)=2+0=22(0)+3(1)=0+3=32(1)+3(0)=2+0=2
So, there is at least one pair of values of the variables for which the two expressions are not the same.
