Answer:
4
Step-by-step explanation:
5 times 12 plus unknown is 80 so 80 divided by 5 is the sum of 12 + unknown number. So 80 divided by 5 is 16. 12 plus unknown is 16 so the unknown number is 4.
To compare these numbers, you must first put them into one format. Since you have mixed numbers, you may have to find and use the LCD.
-2.5, 1/5, 10, -12/4, 18/5, 10 could be simplified somewhat immediately:
-2.5, 1/5, 10, -3, (3 3/5) This set of numbers is simple enough so that you could rearrange them in ascending order mentally:
-3, -2.5, 1/5, (3 3/5), 10
In this case the number of elements in this set is odd, so all you have to do is to select the MIDDLE element: 1/5.
The median is 1/5.
You MUST learn this procedure (arranging the set elements in ascending order and selecting the middle element) so that you can apply it yourself.
the area of a parallelogram is simply
A = bh, b = base, h = height.
so
A = 19 * 12.
and surely you know what that is.
Let's solve for x.<span><span><span><span>5k</span>x</span>+6</span>=<span><span>7k</span>x</span></span>
Step 1: Add -7kx to both sides.<span><span><span><span><span>5k</span>x</span>+6</span>+<span>−<span><span>7k</span>x</span></span></span>=<span><span><span>7k</span>x</span>+<span>−<span><span>7k</span>x</span></span></span></span><span><span><span>−<span><span>2k</span>x</span></span>+6</span>=0</span>
Step 2: Add -6 to both sides.<span><span><span><span>−<span><span>2k</span>x</span></span>+6</span>+<span>−6</span></span>=<span>0+<span>−6</span></span></span><span><span>−<span><span>2k</span>x</span></span>=<span>−6</span></span>
Step 3: Divide both sides by -2k.<span><span><span><span><span>−<span><span>2k</span>x</span></span><span>−<span>2k</span></span></span></span></span>=<span><span><span><span>−6</span><span>−<span>2k</span></span></span></span></span></span><span>x=<span><span>3/<span>k</span></span></span></span>
To solve a problem like this, we can setup a basic algebraic equation.
52+14=x
66=x
We know this equation is true because 14 years ago, she was 52 so 14 years later, she is 66.