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4 years ago

In 2012, five U.S postal stamps cost $2.20. how much did seven stamps cost? answer please

2 answers:

6 0

This is very easy to solve. You know that 5 stamps costs $2.20. To find out how much 1 stamp is you have to divide $2.20 by 5.
$2.20/5=$0.44
So now we know that 1 stamp is 44 cents.
Since you want to know how much 7 stamps cost, you have to add two more stamps to the stamps you already have.
5 stamps=$2.20+ 1 stamp= $0.44 + 1 stamp= $0.44
2.20+0.44+0.44= 3.08
So, 7 stamps costs $3.08.
Get it? Let me know if you still don't understand.

Kruka [31]4 years ago

3 0

You'd do $2.20 and multiply it by seven. Which would give you $15.40, according to my calculations.

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What is the slope of the line with the coordinates (0,0) and (-4,7).

Citrus2011 [14]

Answer:

Slope = -7/4

Step-by-step explanation:

Let's find the slope between your two points.

(0,0) ; (−4,7)

(x1,y1) = (0,0)

(x2,y2) = (−4,7)

Use the slope formula:

m = y2−y1 / x2−x1

= 7−0/−4−0

=7/−4

= −7/4

Answer:

m= −7/4

Hope this helps!!

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4 years ago

Perform the following operations and write the answers in radical form. Part A:√7+√3+√98−√18 Part B:3√5−3√11+2√121−3√90

Sveta_85 [38]

Answer:

$\sqrt{7}+\sqrt{3}+4\sqrt{2}$
$3\sqrt{5}-3\sqrt{11}+22-9\sqrt{10}$

Step-by-step explanation:

Part A ;

$\sqrt{7} +\sqrt{3} +\sqrt{98} -\sqrt{18} \\\\\sqrt{98}=7\sqrt{2}\\\sqrt{18}=3\sqrt{2}\\\\=\sqrt{7}+\sqrt{3}+7\sqrt{2}-3\sqrt{2}\\\\\mathrm{Add\:similar\:elements:}\:7\sqrt{2}-3\sqrt{2}=4\sqrt{2}\\\\=\sqrt{7}+\sqrt{3}+4\sqrt{2}$

Part B ;

$3\sqrt{5} - 3\sqrt{11} + 2\sqrt{121} -3\sqrt{90} \\\\2\sqrt{121}=22\\3\sqrt{90}=9\sqrt{10}\\\\=3\sqrt{5}-3\sqrt{11}+22-9\sqrt{10}$

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Step-by-step explanation:

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