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2 years ago

I don't understand please help

Mathematics

1 answer:

lapo4ka [179]2 years ago

8 0

So for the first problem;
You will take the cost of the glue $2.39 and take away the cost of the tape. Which is $1.99
$2.39 - 1.99$
$= 0.40$

So the answer to problem 1. will be $0.40 more.

For the second problem;
We will add the cost of the markers together, then add the cost of the paper onto that.
$4.50 + \times 2 + 3.79$
$9 + 3.79$
$= 12.37$
Leaving the second answer to be $12.39.

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Ahat [919]

Answer:

0.5 miles/ 10 minutes* (60 minutes/ 1 hour)= 3 miles/hour.

0.25 miles/ 6 minutes* (60 minutes/ 1 hour)= 2.5 miles/hour.

The unit rate of Ron is 3 miles/hour.

The unit rate of Steve is 2.5 miles/hour.

Therefore, Ron walks faster~

Step-by-step explanation:

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2 years ago

the equation of a circle in general form is x squared + y squared + 20x + 12 y + 15 equals 0what is the equation of the circle i

Marrrta [24]

Answer: $(x+10)^2+(y+6)^2=121$

Step-by-step explanation:

The equation of a circle in the general form is:

$ax^{2}+by^2+cx+dy+e=0$

The equaton of a circle in standard form is:

$(x-h)^2+(y-k)^2=r^2$

Where the center is at <em>(h, k)</em> and <em>r</em> is the radius

To write the equation of a circle from general form to standard form, you must complete the squaare, as you can see below:

1- Given the equation in general form:

$x^{2}+y^2+20x+12y+15=0$

2- Complete the square:

-Group the like terms and move the constant to the other side.

- Complete the square on the left side of the equation.

- Add the same value to the other side.

Then you obtain:

$(x^{2}+20x)+(y^2+12y)=-15\\(x^2+20x+(\frac{20}{2})^2)+(y^2+12y+(\frac{12}{2})^2)=-15+(\frac{20}{2})^2+(\frac{12}{2})^2\\\\(x+10)^2+(y+6)^2=-15+100+36\\(x+10)^2+(y+6)^2=121$

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3 years ago

There is a total of 45 boys and girls in a choir.

rusak2 [61]

Answer:

16.5 year

Step-by-step explanation:

Using, mean = sum/no. *of observations

Here,

=> 16.2 = (sum of ages of boys)/18

=> 16.2 x 18 = sum of ages of boys

=> 291.6 = sum of ages of boys

Similarly, sum of ages of girls = 27 x 16.7 = 450.9

Mean(total) = (sumof agesof boys + girls)/45

Mean = (291.6 + 450.9)/45 = 16.5

3 0

3 years ago

Read 2 more answers

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11111nata11111 [884]

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