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LenaWriter [7]
2 years ago
7

The sum of two numbers is 170, and their difference is 110. Which is the greater of the two numbers?

Mathematics
2 answers:
Sedaia [141]2 years ago
7 0
Hello!

You can make two expressions based on what you know

x + y = 170
x - y = 110

You can add these expressions to eliminate y

2x = 280

Divide both sides by 2

x = 140

You can now put x into one of the original expression

140 + y = 170

Subtract 140 from both sides

y = 30

So the greater number is 140

Hope this helps!
frez [133]2 years ago
6 0
X+y=170
x-y=110
2x=280
x=140 is an answer
y=30
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Jet001 [13]

Answer:

n=0

Step-by-step explanation:

See pictures

Hope this helps ^-^

6 0
3 years ago
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A new phone costs $230 and the sales tax rate is 7%. What is the total cost of the camera after tax?
rosijanka [135]

That's a question about percentage.

One way to represent percentage is using decimal number. In this way, 1 is equivalent to 100% and the other less percentages using numbers between 0 and 1.

Examples:

  • 90% is equivalent to 0,90.
  • 5% is equivalent to 0.05. It's not 0.5 because 0.5 is equivalent to 50%.
  • 13.17% is equivalent to 0.1317.
  • 245% is equivalent to 2.45.

If we want to know the percentage of a number, we should multiplacate the number by the porcentage in the decimal number form.

Examples:

  • 55.90% of 200 is equal to: 200 \times 0.5590 = 111.8
  • 360% of 88 is equal to: 88\times 3.6 = 316.8

In our problem, we have a phone with a increase of 7%. To solve that, it's important to perceive that $230 is equal to 100% and with a increase of 7%, we will pay 107%.

107% in the decimal number form is 1.07. With that information, we should multiplicate 1.07 by the original value and we will find the answer.

We know that 230\times 1.07 = 246.1, therefore, the total cost of the phone after tax is $246.1.

I hope I've helped. :D

Enjoy your studies. \o/

4 0
2 years ago
Calculate how much each size per gram, and circle which gives the best value for money. 250g for $2.30, 400g for &3.40, 1Kg
Bezzdna [24]
To do this, we must set up ratios:
Option One:
\frac{2.30}{250g}  \\  \frac{0.0092}{1g}  \\ 0.0092/g
The first options costs only $0.0092/gram (a fraction of a penny)!
Option Two:
\frac{3.40}{400g}  \\  \frac{0.0085}{1g} \\ 0.0085/g
The second option costs only $0.0085/gram (cheaper than option one)!
Option Three: 
This requires a little more work. First, we have to convert the grams into kilograms. For every 1 kg, there is 1,000 g. Therefore, 1,000g costs $5.65. Next, we set up the ratio as usual:
\frac{5.65}{1000g} \\  \frac{0.00565}{1g}  \\ 0.00565/g
The third option costs $0.00565/gram.

Therefore, option three is the cheapest! 

Hope this helps!
4 0
3 years ago
Can someone help me please ??
Komok [63]

Answer: discount and a sales price is: 114.75

With total with tax is: 122.20875

Step-by-step explanation:

I got this by see what the price was with the discount and then adding on the tax

4 0
2 years ago
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I will give brainliest to whoever answers this question:) help a dummy out
aliya0001 [1]

Answer:

Step-by-step explanation:

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2 years ago
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