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3 years ago

Help me plz on this one

Mathematics

2 answers:

Oxana [17]3 years ago

7 0

Answer:

9/2

Step-by-step explanation:

Kipish [7]3 years ago

5 0

it is 4 1/2.

(5 – 1) + (4/5-3/10)
=4+ 4x2
- 3/10
5x2
=4+ 8-3/10
= 4+5/10
=4+1/2
=4 1/2

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Lucy and JoJo need to make 140 cupcakes for the school dance,

Pepsi [2]

Answer:

56 cupcakes

Step-by-step explanation:

First, I convert 3/5 to a percent because I prefer to work with percents:

3/5 = 0.6 = 60%

Then, subtract 60% from 100% for the percent of the total cupcakes that JoJo needs to make:

100 - 60 = 40%

Finally, multiply the total cupcakes by the percent as a decimal:

140 × 0.4 = 56

4 0

4 years ago

How would I solve this?

givi [52]

Answer:

The valid value of x is x=-2

Step-by-step explanation:

we know that

The sum of the interior angles of any quadrilateral must be equal to 360 degrees

$(7x^{2}-24x)+100+(24-46x)+(3x^{2}+56)=360$

solve for x

Combine like terms

$10x^{2}-70x+180=360$

$10x^{2}-70x-180=0$

Divide by 10 both sides

$x^{2}-7x-18=0$

The formula to solve a quadratic equation of the form

$ax^{2} +bx+c=0$

is equal to

$x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$x^{2}-7x-18=0$

$a=1\\b=-7\\c=-18$

substitute in the formula

$x=\frac{-(-7)(+/-)\sqrt{-7^{2}-4(1)(-18)}} {2(1)}$

$x=\frac{7(+/-)\sqrt{121}} {2}$

$x=\frac{7(+/-)11} {2}$

$x=\frac{7(+)11} {2}=9$

$x=\frac{7(-)11} {2}=-2$

Remember that

The measure of the interior angle cannot be a negative number

For x=9

we have that the measure of one interior angle of quadrilateral is

$24-46x$

substitute the value of x

$24-46(9)=-390\°$

therefore

The value of x=9 cannot be a solution

For x=-2

The measure of the interior angles are

$(7(-2)^{2}-24(-2))=76\°\\100\°\\(3(-2)^{2}+56)=68\°\\24-46(-2)=116\°$

therefore

The valid value of x is x=-2

7 0

3 years ago

I'll GIVE YOU BRAINLIEST ANSWER!!! If someone can help me with this problem???

frez [133]

The answer is 3x^2 - 3x - 3 with a remainder of -3

6 0

3 years ago

A and B are independent events.<br> P(A) = 0.40<br> P(B) = 0.30<br> what is P(A|B)?

nignag [31]

Answer:

P(A/B)=1.3

Step-by-step explanation:

P(0.40/0.30)=1.3

5 0

3 years ago

The circle will be enlarged by a scale factor of 4.

sertanlavr [38]

Answer:

The area of the new circle is $144\pi \ in^2$

Step-by-step explanation:

Given:

radius of the circle = 3 in.

we know that

If two figures are similar, then the ratio of its areas is equal to the scale factor squared.

Let

z-----> the scale factor

x-----> the area of the enlarged circle

y-----> the area of the original circle

So;

$z^2= \frac{x}{y}$

In this problem we have

$z=4$ ----> the scale factor

The area of the original circle is equal to

$y = \pi r^2= \pi (3)^2= 9\pi \ in^2$

Now substituting value of y and solve for x we get;

$4^2=\frac{x}{9\pi}\\ \\x= 16\times9\pi= 144\pi \ in^2$

Hence Area of the new Circle is $144\pi \ in^2$

Also The area of the enlarged circle is 16 times the area of the original circle.

4 0

4 years ago