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2 years ago

What is the area of triangle ABD? 7 cm 2 3.5 cm 2 6 cm 2 4.5 cm 2

Mathematics

1 answer:

Andrej [43]2 years ago

5 0

Answer:

4.5cm^2

Step-by-step explanation:

To find area of a triangle the formula is --> 1/2 base times height

so 3cm x 3cm = 9cm and divide by 2 --> 4.5 cm^2

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What is the area of a circle. Using 3.14 for. A circle with diameter of 8.4 ft.

ira [324]

Hey there! I'm happy to help!

First, let's find the radius. The radius is half of the diameter.

8.4/2=4.2

Here's how to find the area of a circle.

Square the radius.

4.2²=17.64

And multiply by pi (3.14 in our case)

17.64(3.14)=55.3896

We round to the nearest tenth, giving us an area of 55.4 ft²

Have a wonderful day! :D

5 0

2 years ago

The sum of two numbers is 9.9, and the sum of the squares of the numbers is 53.21. What are the numbers?

Snezhnost [94]

Answer:

There are two possibilities:

$x_{1} = 3.5$ and $y_{1} = 6.4$

$x_{2} = 6.4$ and $y_{2} = 3.5$

Step-by-step explanation:

Mathematically speaking, the statement is equivalent to this 2-variable non-linear system:

$x + y = 9.9$

$x^{2} + y^{2} = 53.21$

First, $x$ is cleared in the first equation:

$x = 9.9 - y$

Now, the variable is substituted in the second one:

$(9.9-y)^{2} + y^{2} = 53.21$

And some algebra is done in order to simplify the expression:

$98.01-19.8\cdot y +2\cdot y^{2} = 53.21$

$2\cdot y^{2} -19.8\cdot y +44.8 = 0$

Roots are found by means of the General Equation for Second-Order Polynomials:

$y_{1} \approx \frac{32}{5}$ and $y_{2} \approx \frac{7}{2}$

There are two different values for $x$ :

$y = y_{1}$

$x_{1} = 9.9-6.4$

$x_{1} = 3.5$

$y = y_{2}$

$x_{2} = 9.9 - 3.5$

$x_{2} = 6.4$

There are two possibilities:

$x_{1} = 3.5$ and $y_{1} = 6.4$

$x_{2} = 6.4$ and $y_{2} = 3.5$

5 0

2 years ago

Units are squared when dealing with area but not when dealing with perimeter

Mashcka [7]

The answer is true I believe

7 0

3 years ago

Juan starts a new coffee shop. The table shows the coffee sales at his shop for the first 5 days. What is the average rate of ch

vodomira [7]

Answer:

Average rate of change from day 2 to day 5 is $43.33/day.

Step-by-step explanation:

Sales on day 2 = 200

Sales on day 5 = 330

Rate of change = $\frac{330-200}{5-2} =\frac{130}{3}=43.33$

3 0

1 year ago

Does the graph below represent a proportional relationship?

aleksklad [387]

The answer is A.
The reason being straight lines mean equal proportions, while curved lines are exponential or quadratic.

6 0

2 years ago

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