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patriot [66]
2 years ago
9

Kara has 21 collectible buttons to sell. She sells the small buttons for $3 and the large buttons for $4, and earns a total of $

68. If the small buttons are represented by x and the large buttons are represented by y, which of the following systems of equations can be used to calculate the number of large and small buttons sold? (5 points)
Mathematics
1 answer:
Nostrana [21]2 years ago
5 0
System of equations that can be used to solve for both x and y are:
x + y = 21 (since she sold 21 all together)
3x + 4y = 68 (cost of each and total earned)
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Kevan is 6 years younger than his sister Katie. Melanie is twice as old as kevan. How old are all three siblings?
trapecia [35]
(Kevin) y= k-6 - k minus six

(Melanie) y= 2(k-6) - two times k minus six


K, only got that far... sorry
6 0
3 years ago
A line passes through (6, 3), (8, 4), and (n, -2). Find the value of n.
timurjin [86]

Answer:

n = -4

Step-by-step explanation:

Notice how in the previous examples they all divide by 2? It is the same case here. So now the question is... "what" divided by "2" is "-2".

Let me show you:

n ÷ 2 = -2

if you know your integer math, you should know that...

-4 ÷2 = -2 (this is the correct equation)

8 0
1 year ago
3 Simplify the expression: 5! 2:3! 4. Simplify the expression:​
vredina [299]

Answer:

10

Step-by-step explanation:

5! 2:3! 4  \\  \\ =  \frac{5! \:  .2}{3! \: . 4}  \\  \\  =  \frac{5.4. \cancel{3!} \: . 2}{\cancel{3!} \:  .4}  \\  \\  =  \frac{40}{4}  \\  \\  = 10

6 0
3 years ago
Use set notation to write the members of the following set, or state that the set has no members. Odd numbers between 2 and 82 t
adell [148]

Let the set of all Odd multiples of 9 between 2 and 82 be denoted by D, then, using set-builder notation,

D=\{ 18n+9 \mid n \in \mathbb{N}, 0\le n\le 4 \}

The odd multiples of 9, m, in the range 2\le m \le 82 form the set

\{9,27,45,63,81\}

Each member of the set is a term of the arithmetic progression

U_n=18n+9

where the values of n range from 0 to 4, or 0\le n\le 4

Putting these facts together, we get the result

D=\{ 18n+9 \mid n \in \mathbb{N}, 0\le n\le 4 \}

Learn more about set-builder notation here: brainly.com/question/17238769

3 0
2 years ago
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Verdich [7]

 the first option is the answer

Step-by-step explanation:

4c + 6a <= 120 [building hours]

4c + 4a <= 100 [testing hours]

4 * 20 + 6 * 6 <= 120

80 + 36 <= 120

116 <= 120

true, they have enough building hours

4 * 20 + 4 * 6 <= 100

80 + 24 <= 100

104 <= 100

false, they won't have enough testing hours

the first option is the answer

3 0
3 years ago
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