Answer:
Third one I believe
Step-by-step explanation:
Answer:
n²-7n-21
Explanation:
Given the expression:
First, open the brackets:
Next, bring the like terms together and simplify:
Answer:
4
Step-by-step explanation:
Step 1:
6x - 8 = 4x Equation
Step 2:
6x = 4x + 8 Add 8 on both sides
Step 3:
2x = 8 Subtract 4x on both sides
Step 4:
x = 8 ÷ 2 Divide
Answer:
x = 4
Hope This Helps :)
Since they're vertical angles, they're equal in degree measure
since they're equal, we can make the two expressions equal to each other
5a - 1 = 2a + 20
add 1 to both sides
5a = 2a + 21
subtract 2a from both sides
3a = 21
divide both sides by 3a
a = 7
now, plug the answer you found for a into one of the two expressions
5a - 1 becomes (5*7) - 1, which equals 34
to double check that they're equivalent (since they're vertical angles)
2a + 20 becomes (2*7) + 20, which equals 34
both angles are 34 degrees!
