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grin007 [14]
1 year ago
11

An online electronics store bought 20 keyboards and 15 phone chargers for $130 and then sold each keyboard for $30 and each phon

e charger for $15.
Part A: Which expression represents the amount of money the store made?
(20)(30) + (15)(15) − 130
(20)(15) + (15)(30) − 130
(20)(30) + (15)(15) + 130
(20)(15) + (15)(30) + 130

Part B: Explain why your answer to Part A is correct.

Part C: What is the value of the expression you chose in Part A? Show each step of your work.

Help plsss
Mathematics
2 answers:
konstantin123 [22]1 year ago
8 0
Part a is the fourth one.
maks197457 [2]1 year ago
7 0

Answer:

(20)(30) + (15)(15) − 130

Step-by-step explanation:

Part A: (20)(30) + (15)(15) − 130

Part B (and maybe C. im not sure): Each keyboard is sold for $30 and there are 20 keyboards. So 20*30 is better than writing 30*30*30*30.....

There are 15 chargers and each one is sold for $15. So 15*15 is the answer.

The 130 has a minus (before it) because $130 was spent when they bought 20 keyboards and 15 chargers.

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The question is:
saul85 [17]
f(x) = \sqrt{x+1} \\ y = \sqrt{x+1} \ or \ y^2 = x+1 \ or \ x = y^2 - 1 \\ Therefore, \ f^{-1}(x)=x^2 - 1

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3 years ago
Kelsey makes pendants that she would like to sell at an upcoming craft fair. She must pay $200 to rent a booth at the craft fair
lubasha [3.4K]

Answer:

Additional <em>26</em> pendants are to be sold to make profit.

Step-by-step explanation:

Rent of booth at the craft fair = $200

Cost of material for each pendant = $7.80

Let Kelsey makes x number of pendants.

To calculate the total spending, we have to add the rent of booth at the craft fair and cost of material for x number of pendants.

Cost of material for x number of pendants = Cost of material for each pendant multiplied by number of pendants

Cost of material for x number of pendants = $7.80 \times x

So, total cost = $200 +  $7.80 \times x

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For making profit, total money made must be greater than the total cost.

Therefore, the inequality becomes:

\bold{13.50 \times x  > 200+7.80\times x }

Let us solve the inequality now:

13.50x - 7.80x>200\\\Rightarrow 5.7x > 200\\\Rightarrow \bold{x > 35.08}

So, at least 36 pendants are to be sold to make a profit.

Additional 36-10  = <em>26</em> pendants are to be sold to make profit.

5 0
3 years ago
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Answer:

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So,

An = A[n - 1] + 3/5

Explicit:​

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