Which method do you prefer to use to find sums

Mathematics

2 answers:

VMariaS [17]3 years ago

4 0

Usually you use addition to find a sum.

REY [17]3 years ago

3 0

You usually use addition to find the sum

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james invested some money at 13% interest. James also invested $199 more than 3 times that amount at 12%. How much is invested a

Komok [63]

9514 1404 393

Answer:

$3138 at 13%
9613 at 12%

Step-by-step explanation:

Let x represent the amount invested at 13%. Then (3x+199) is the amount invested at 12%. The total interest earned in 1 year is ...

(13%)(x) +(12%)(3x+199) = 1561.50

0.49x +23.88 = 1561.50 . . . . simplify

0.49x = 1537.62 . . . . . . . . . . subtract 23.88

x = 3138 . . . . . . . . . . . . . . . . divide by 0.49

3x+199 = 9613

$3138 was invested at 13%; $9613 was invested at 12%.

8 0

2 years ago

A pretzel has a mass of 5 grams. What is its mass in milligrams?

4vir4ik [10]

The answer is C because if you convert it gives you 50

3 0

3 years ago

How the heck do I do this? And what’s the answer?

stira [4]

Answer:

Option A

Step-by-step explanation:

We need to find two expressions that, when simplified, give the same results.

1) First, simplify the expression stated in the question. Multiply each of the terms in the parentheses by the number that is next to them. This would mean you have to multiply both 9x and -6 by $\frac{2}{3}$ . You also have to multiply $\frac{1}{2}x$ and $-\frac{1}{2}$ by 4. Then, simplify.

$\frac{2}{3}(9x-6) + 4 (\frac{1}{2} x - \frac{1}{2})\\\frac{18}{3}x- \frac{12}{3} + \frac{4}{2}x -\frac{4}{2} \\6x - 4 + 2x - 2$

2) Now, combine the like terms.

$6x - 4 + 2x - 2$

$8x - 6$

So, we need to find which of the expressions listed equal 8x - 6.

3) Let's try option A. Do the same as before. Multiply each of the terms in the parentheses by the number that is next to them. So, multiply 4x and -12 by $\frac{3}{4}$ . Also, multiply 30x and 18 by $\frac{1}{6}$ . Then, combine like terms and simplify.