Answer:
Overall vertical is visually better, if done correctly
it forces you to "line up" all the common exponents.
The disadvantage is that it usually requires re-writing the problem, and it takes up space.
most problems are presented horizontally, that becomes the issue to locate the common exponents.
in both cases the biggest issue is people forget
that when subtracting "subtracting a negative is like adding a positive"
-5x - (-8x) = 3x [that is a positive 3x]
or:
-7x
- - 10x
-------------
3x
everyone misses those eventually so you have to watch out for that in both methods
Step-by-step explanation:
Let's say that the value invested in the account with a rate of 8% is "x", then the amount invested in the account with a rate of 12% is:
To calculate the total interest we need to calculate the interest of each individual account and sum them:
The total interest is the sum of the two expressions above:
The value invested in the account with 8% interest is 830, the one invested in the account with 12% interest is 1280.
Two is equivalent to twenty and 84
Answer:
x = 4
Step-by-step explanation:
First you would add those 2 equations, which would be 43x + 8. Then you make it equal to 180, so 43x + 8 = 180. Subtract 8 from both sides, and divide 43 from both sides.
Answer:
31
/40
Step-by-step explanation:
Find the least common denominator or LCM of the two denominators:
LCM of 5 and 8 is 40
For the 1st fraction, since 5 × 8 = 40,
