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Karolina [17]
2 years ago
7

a cell phone store sells the basic model of a phone for $30 and the upgraded model for $100 when a customer signs a two-year agr

eement. on tuesday, the store has $900 in sales. the store pays $5 for each basic model and $25 for each upgraded model. if the cost of the cell phones sold on tuesday is $200, how many upgraded models were sold?
Mathematics
2 answers:
alisha [4.7K]2 years ago
8 0
30b + 100u = 900
5b + 25u = 200....multiply by -6
------------------
30b + 100u = 900
-30b - 150u = - 1200 (result of multiplying by -6)
------------------add
-50u = - 300
u = 6 <== upgrated phones sold

30b + 100u = 900
30b + 100(6) = 900
30b + 600 = 900
30b = 900 - 600
30b = 300
b = 10 <== basic phones sold

JulijaS [17]2 years ago
7 0

Answer:

10

Step-by-step explanation:


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Temka [501]
Hey there!

Let's first define our goal. Our goal here is to be able to isolate the variable, n, and solve for it by moving everything to the other side. We see that we have two sides of the equation, and by using the property of equality which states that whatever you do to one side you do to the other and the expression remains equal, we can solve this equation.

It looks like the only thing we have on the left side with n is that 6 1/2. In order to get rid of it, we must subtract it from both sides, because the property of equality states you must do the inverse operation.

We have:

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Hope this helps!
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2 years ago
(–23) – 45 – (–98) = ?
lisabon 2012 [21]
(–23) – 45 – (–98) =–23 – 45 +98=-68+98=30
6 0
3 years ago
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A line through the origin has a slope of 1 / 3. Carlos thinks the slope of a perpendicular line at the origin will be 3.
OLEGan [10]

Answer:

Carlos is incorrect.

Step-by-step explanation:

We have been given that a line through the origin has a slope of \frac{1}{3}. Carlos thinks the slope of a perpendicular line at the origin will be 3.

We know that the slope of a perpendicular line to a given line is always negative reciprocal of the slope of the given line.

The slope of the perpendicular line at the origin will be negative reciprocal of \frac{1}{3}.

Let us find negative reciprocal of \frac{1}{3} as:

-\frac{1}{\frac{1}{3}}=-\frac{1\cdot 3}{1}=-3

Since the slope of a perpendicular line at the origin is -3, therefore, Carlos is incorrect.

4 0
2 years ago
Skill in adding and subtracting decimals is useful for calculating ______ .
Sholpan [36]

Answer:

<u>the amount saved in buying a pair of $32.95 blue jeans on sale for $26.50</u>

Step-by-step explanation:

all are pretty good answers but that one is most reasonable

have a nice day :)

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Thanks if u can do all of these for me!!! I need the work and the answers thank u!!;)
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