All categories

3 years ago

Help me!!!!!!!!!???!!!!!!!!!!!!!!;

Mathematics

1 answer:

frozen [14]3 years ago

3 0

20,112.5 meters

Multiply the length of the track by 10, then multiply that number by 5

You might be interested in

Match each form with its equation.

Rasek [7]

Answers

1.Slope-intercept form
2.Point-Slope form
3.Standard Form
4.Vertical Line
5.Horizonal Line

7 0

3 years ago

A circle has an area of 324π cm2. What is the radius? a. 18 cm c. 18π cm b. 36π cm d. 36 cm

mars1129 [50]

Answer:

a. 18 cm

Step-by-step explanation:

We are given that a circle has an area of 324π cm2. We are required to determine its radius. The formula for the area of a circle with radius r units is;

$A=pi*r*r$

We plug in the area given and solve for r;

$324pi=pi*r^{2}\\\\r^{2}=324\\\\r=18$

The radius of the circle is 18 cm

5 0

4 years ago

Read 2 more answers

A radio station will announce the winner of a contest when 3,200 callers have phoned the station. At 3:00 p.m. 400 callers were

arsen [322]

???????????????????????????

5 0

3 years ago

Simplify -6i(8-6i)(-8-8i)

padilas [110]

Answer:

-96 + 672\,i

Step-by-step explanation:

This is a product of complex numbers, so we have in mind not only the general rules for multiplying binomials, but also the properties associated with the powers of the imaginary unit "i", in particular $i^2=-1$

We start by making the first product indicated which is that of a pure imaginary number (-6i) times the complex number (8-6i). We use distributive property and obtain the new complex number that results from this product:

$-6\,i\,(8-6\,i)= (-6\,i)\,* 8 \, -\,6\,i\,(-6\,i)=-48\,i+36\,i^2=-48\,i+36\,(-1)=-36-48\,i$

Now we make the second multiplication indicated (using distributive property as one does with the product of binomials), and combine like terms at the end:

$(-36-48\,i)\,(-8-8\.i)=(-36)\.(-8)+(-36)(-8\,i)+(-48\,i)\,(-8)+(-48\,i)(-8\,i)=\\=288+288\,i+384\,i+384\,i^2=288+288\,i+384\,i+384\,(-1)=\\=288-384+288\,i+384\,i=-96+672\,i$

5 0

3 years ago

PLEASE HELP!! IM ON THE LAST QUESTIONNNN ( 30 points!)

dusya [7]

$~~~~~\pi r^2 = 513\\\\ \implies r = \sqrt{\dfrac{513}{\pi}}\\\\ \implies r= \sqrt{\dfrac{513}{3.14}}\\\\\implies r=12.78~ \text cm.}\\\\\text{Hence the radius is 12.78 cm.}$

3 0

2 years ago

Read 2 more answers