4 years ago

Multiply and put in simplest form: 2x(4x+5) ANSWER= 8x^2+10x Why is 8x squared?

1 answer:

5 0

Because you're multiplying $2x$ by $4x$ . $2*4$ is $8$ , $x*x$ is $x^2[tex], and [tex]8*x^2$ is $8^2$ . Since you're multiplying them all together, it doesn't matter what order you multiply them in. For example, $2*x=2x$ , $x*4=4x$ , and [2x*4x=8x^2[/tex] (but that's just the same.)
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</em><em>Hope that helps! :)</em>

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Write in exponential notation: 301=

dalvyx [7]

Answer:

$3.01 * 10^2$

Step-by-step explanation:

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4 0

3 years ago

Select the correct answer from each drop-down menu. In a circle with a radius of 7 feet, the radian measure of the central angle

trasher [3.6K]

In a circle, the number of radians is proportional to the relative length of the arc, in comparison to the radius. We have that if we denote by x the radians, the following proportionality holds, relating angles and lengths:
$\frac{x}{2\pi} = \frac{4}{2 \pi 7}$
because the total of angles in radians is 2pi and the total circumference is 2pi times the radius. Hence, by solving for x we get: x=4/7=0.57 rad

We also have that the area is proportional to the angles. The total are is $\pi r^2$ . Hence, A= $\frac{4}{2 \pi 7 } *\pi* 7^2= 14 square feet.$