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RoseWind [281]
2 years ago
8

Beverley has quarters and dimes in her pocket. She has 21 coins with a total value of $3.00. How many of each type of coin does

she have? [?] quarters [ dimes Enter the number that belongs in the green box. Enter​

Mathematics
1 answer:
kondaur [170]2 years ago
6 0

Answer:

Step-by-step explanation:

If all 21 coins were dimes, she'd have $2.10. But she has 90 more cents than that. Now for each coin that's a quarter, not a dime, she has 15 cents more. 90/15= 6. So there are 6 quarters, and 21-6 = 15 dimes.

Now we do it backwards to see if it's right. 6 quarters is $1.50, 15 dimes is $1.50, add those together and you get $3. So it's right. 6 quarters, 15 dimes.

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A snail moves 18 millimeters every 24 seconds. What is the snail's rate of speed ?​
andrey2020 [161]

Answer:

0.75m/s

Step-by-step explanation:

<em>Speed formula: ⇒ S=\frac{V}{T}</em>

<em>Divide by the numbers from left to right.</em>

<em>S=18</em>

<em>T=24</em>

<em>18/24=0.75</em>

<em>0.75m/s is the correct answer.</em>

<em>I hope this helps you, and have a wonderful day!</em>

4 0
3 years ago
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Y=3x+14<br> 2x-3y=-14<br> Substitution method
Montano1993 [528]

Answer:

x = -8

Step-by-step explanation:

y = 3x + 14

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So, what is the substitution? Y of course, this is because y is equal to 3x + 14.

2x - 3 (3x + 14) = -14

Multiply 3 with the numbers in the parentheses.

2x - 9x + 42 = -14

So you maybe be wondering why it is a negative 7 instead of subtracting 9 with 2. Using PEMDAS, we always read from left to right. So it is basically 2 -9 and you get -7.

-7x + 42 = -14

Then subtract 42 from both sides.

-7x + 42 - 42 = -14 - 42

Simplify

-7x = -56

Divide 7 by both sides.

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And you might ask, why we get x instead afterwards. This is because both -7 and 7 cancel each other out leaving us with x.

4 0
2 years ago
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olchik [2.2K]

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D

Step-by-step explanation:

hope it helps :)

have a nice day or night

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3 years ago
A line passes through the points (1, 4) and (3, 4). Which is the equation of the line?
xeze [42]

Answer:

y = -4x + 8

Step-by-step explanation:

Slope-Intercept Form: y = mx + b

Slope Formula: m=\frac{y_2-y_1}{x_2-x_1}

Step 1: Find slope <em>m</em>

<em />m=\frac{-4-4}{3-1}<em />

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Step 2: Find y-intercept <em>b</em>

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Step 3: Rewrite linear equation

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