Solving these is quite simple; think of "a number" as a value of either n or x (depending on personal preference) then just find the operations being done based on key words;
1. Sum= addition so it is x+5
2. Decrease= subtraction so it is 11-n
3. Quotient= division so it is -9/y
4. Twice= multiply by two, minus= subtract, so it is 2n-13
-2 times -2 will give you 4 or (-2 x -2=4)
-8 times -2 will give you 16 or (-8 x -2=16)
16 times -2 will give you -32 or (16 x -2=-32)
I believe it is 21 and all so if u are having trouble in mathematics a good app to have is Pappa math algebraic calculator
Answer:
Step-by-step explanation:
Set up the following proportion and solve for :
Answer:
x = 6.5
Step-by-step explanation:
The sum of the angles of a triangle is 180
8x+ 10x-10 + 10x +8 = 180
Combine like terms
28x -2 = 180
Add 2 to each side
28x-2+2 = 180+2
28x=182
Divide by 28
28x/28 = 182/28
x =6.5