Area of a triangle is equal to 1/2 b(h) so since you already have the height and base, all you need to do is input it back into the equation:
(10)(13)
Multiply 10 & 13 to equal
(130)
Then take half of 130 to get
A = 65
x+3x= 4x
Because there is a invisable 1 in front of the X. Hope this helps!
Option A: 
is the value of 
Explanation:
It is given that the first term is 
The common difference is 
We need to determine the sum of 25 terms.
The sum of terms of an arithmetic series can be determined using the formula, ![S_n=\frac{n[2a_1+(n-1)d]}{2}](https://tex.z-dn.net/?f=S_n%3D%5Cfrac%7Bn%5B2a_1%2B%28n-1%29d%5D%7D%7B2%7D)
Substituting 
, and
Thus, we have,
![S_{25}=\frac{25[2(20)+(25-1)(-10)]}{2}](https://tex.z-dn.net/?f=S_%7B25%7D%3D%5Cfrac%7B25%5B2%2820%29%2B%2825-1%29%28-10%29%5D%7D%7B2%7D)
Simplifying the values, we get,
![S_{25}=\frac{25[40+(24)(-10)]}{2}](https://tex.z-dn.net/?f=S_%7B25%7D%3D%5Cfrac%7B25%5B40%2B%2824%29%28-10%29%5D%7D%7B2%7D)
![S_{25}=\frac{25[40-240]}{2}](https://tex.z-dn.net/?f=S_%7B25%7D%3D%5Cfrac%7B25%5B40-240%5D%7D%7B2%7D)
Subtracting the terms within the bracket, we get,
![S_{25}=\frac{25[-200]}{2}](https://tex.z-dn.net/?f=S_%7B25%7D%3D%5Cfrac%7B25%5B-200%5D%7D%7B2%7D)
Multiplying the terms in the numerator, we have,
Dividing, we get,
Thus, the sum of the 25 terms is
Therefore, Option A is the correct answer.
Answer:
x=3
Step-by-step explanation:
Simplifying
4(4x + -3) = 36
Reorder the terms:
4(-3 + 4x) = 36
(-3 * 4 + 4x * 4) = 36
(-12 + 16x) = 36
Solving
-12 + 16x = 36
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '12' to each side of the equation.
-12 + 12 + 16x = 36 + 12
Combine like terms: -12 + 12 = 0
0 + 16x = 36 + 12
16x = 36 + 12
Combine like terms: 36 + 12 = 48
16x = 48
Divide each side by '16'.
x = 3
Simplifying
x = 3
0.13 , 0.19, 0.30 & 0.31 that's the answer
