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nasty-shy [4]
3 years ago
14

Find two numbers whose sum is 67 and whose difference is 13

Mathematics
2 answers:
Gnom [1K]3 years ago
7 0
<span>You have to solve this system of equations to get the answer. One way you could go about that would be to add the systems together. This will eliminate the y and turn it into a single variable algebra problem. x+y=42 x-y=16 ------- 2x = 58 Once you solve that for x, you can plug that result back in to either of the first two equations and solve for y.</span>
goblinko [34]3 years ago
5 0
I believe it's 40 and 27
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I am not sure how sigma notation works, can somebody explain how to solve this? It isn't the second choice.
Masja [62]

Answer:

first answer is correct

Step-by-step explanation:

Hello, we want to write 2 + 4 + 6 + ... + 20

for n = 1, 2n = 2*1 =2

for n = 2, 2n = 2*2=4

for n = 3, 2n=2*3=6

etc

so

\displaystyle \sum_{n=1}^{10} {2n} = 2*1 + 2*2 +2*3+2*4+...+2*10=2+4+6+8+...+20

thanks

6 0
3 years ago
Which pair shows equivalent expressions?
HACTEHA [7]

Answer:

18/6=324/6=418/24=3/4

Step-by-step explanation:

if you multiply 2 times something you can’t get anything 11. the closest denominator is 5 and 5x2=10 so you have one left to get 11 so the answer is =5with 1$ still left. maria can buy 5 fish but she will have 1$ left over.

Hope this helps.

8 0
3 years ago
What is the slope of the line that is perpendicular to a line whose equation 3y=-4x+2?
Zarrin [17]
The slopes of lines perpendicular to each other are opposite reciprocals. So, if you are given that the slope of a line is 3 and need to find the slope of a line perpendicular to that line, you'd flip that number around and negate it, leaving you with -1/3.

To find the slope of the given line, first get it into slope-intercept form (y - mx + b, where m is the slope and b is the y-intercept).

    3y = -4x + 2
    y = -4/3x + 2/3

The slope is -4/3. To find the slope of a perpendicular line, find its opposite reciprocal. It is 3/4.

Answer:
3/4 (the first option)
6 0
3 years ago
Help with 58 plzzzz thanks
DanielleElmas [232]
The answer is : D. 2*2*2*2*2*5
6 0
3 years ago
Read 2 more answers
.............................
goldfiish [28.3K]
It's B and C
hope this helps
4 0
3 years ago
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