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4 years ago

13

Maria sold 28 skateboards over the weekend at her toy store. This was 30% of all the skateboards she had in stock. How many skat

eboards were in stock?

2 answers:

Rina8888 [55]4 years ago

6 0

Answer:

196

Step-by-step explanation:

28 x 7 + 196

drek231 [11]4 years ago

3 0

Answer : 93 skateboards were in stock approximately.

Step-by-step explanation:

Concept of Percentage: by a certain percent, we mean how many hundredths.

Thus, x percent means x hundredths, written as x%

To express x% as a fraction: we have, x% = x/100

If we call S, the number of skateboards that we had in stock, and now they tell us that we have sold 30% of that amount, which were 28 units, this means:

S · 30/100 = 28 units

Then, S = 28·100/30 = 2,800/30 = 93.33 => aprox. 93 units

Answer : 93 skateboards were in stock approximately.

Verification:

We can calculate 30% of 93 skateboards

93 · 30/100 = 27.9 approximately = 28 skateboards

$\textit{\textbf{Spymore}}$

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Please help! .........

stira [4]

Answer:

1) When x is 1, y is 4, and vice versa

2) When x is -6, y is 42, and when x is 7, y is 114

3) When x is -2, y is 2, and when x is 8, y is 42

Step-by-step explanation:

1)

$y=x^2-6x+9$

$y+x=5$ which can be rearranged as $y=5-x$ .

Substituting this lone y into the first equation, you get:

$5-x=x^2-6x+9$

Move everything to one side:

$x^2-5x+4=0$

Factor:

$(x-4)(x-1)=0$

$x=1, 4$

$y=4, 1$

2)

$y-30=12x$ which can be rearranged as $y=12x+30$ .

$y=x^2+11x-12$

Let's use elimination this time and subtract the first equation from the second:

$0=x^2-x-42$

Factor:

$(x-7)(x+6)=0$

$x=-6, 7$

$y= -42, 114$

3)

$y=x^2-2x+6$

$y=4x+10$

Let's set the two equations equal to each other through substitution:

$x^2-2x-6=4x+10$

Move everything to one side:

$x^2-6x-16=0$

Factor:

$(x-8)(x+2)=0$

$x=-2, 8$

$y= 2, 42$

Hope this helps!

6 0

3 years ago

I would like to know how to simplify these fractions with a logical reasoning

Andrei [34K]

The answer is 6 square root of 3.
4 times 12 square rooted minus 2 times square root of 3 = 10.39230485 =
6 square root of 3.

4 0

3 years ago

Explain how to draw a circle with a circumference of 3.14^2 inches. then draw the circle.

ch4aika [34]

This is what I would do.

The general formula for the circumference of a circle is

$2\pi \: r$

where r is the length of the radius of the circle. Simply use the formula to find r so that you can draw the circle:

$2\pi \: r = 3.14 ^{2} inches \\ r = \frac{3.142 ^{2} }{2\pi} = 1.571 \: inches$

Now, draw a circle with a radius of 1.571 inches. This number has been rounded up to 3 significant figure. Hope this helps!

4 0

4 years ago

. Freddie swam 3/8 laps yesterday and 1/4 today. How many laps did he swim in total? IS

Ronch [10]

Answer:

5/8

Step-by-step explanation:

Freddie swam 3/8 laps yesterday

He also swam 1/4 laps today

Therefore the total lap swam can be calculated as follows

= 3/8 + 1/4

= 5/8

Hence the total lap is 5/8

8 0

3 years ago

Can someone help me with number 2. Please explain your answer.

yKpoI14uk [10]

4x+y = 20
3x+y = 2
4x+y-3x-y = 20-2
x = 18

3x+y = 2
3.18 + y = 2
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6 0

3 years ago