Answer:

Step-by-step explanation:
So we know that:

And that the two angles are vertical angles.
Since they are vertical angles, their measurements are equivalent. Thus, to find x, set the equations equal to each other:

Now, solve for x. Add 30 to both sides. The left side cancels:

Now, subtract 2x from both sides. The right cancels:

Thus, the value of x is 21.
Answer:
x = 7 cm
Step-by-step explanation:
12x9 + 3x = 129
108 + 3x = 129
3x = 21
x = 7 cm
Answer: Blake still has to mow 17,424 acres.
There are 43,560 square feet in an acre.
Blake has already mowed 60% of the lawn, leaving him 40% more to mow.
All we have to do is multiply 17,424 by 0.4 to find the number of square feet remaining.
43560 x 0.4 = 17424
Hi there!
You should always find the value inside the parenthesis first when simplifying an equation.
Tell me if you need help solving the equation!
Hope this helps!