Mathematics College

x2 - 81 = 0

What is x2

Answers

Answer 1

Answer:

x = 9 and -9

Step-by-step explanation:

[tex]x^{2}[/tex] -81 = x add 81 to both sides of the equation

[tex]x^{2}[/tex] = 81 What number times itself equals 81? 9 and -9

Answer 2

Answer: + 9

Step-by-step explanation: add 81 to both sides to isolate x^2. we get x^2= 81. take the square root of both sides. the square root of x^2 is x and square root of 81 is 9 or -9. so x = 9 and -9.

Related Questions

12. The name of each contestant is written on a separate card, the cards are
placed in a bag, and three names are picked from the bag. What of type
sampling is used? *
OA) Random
OB) Cluster
C) Convenience
OD) Stratified
E) Systematic

Answers

Answer:

Random

Step-by-step explanation:

The event that was picked from the bag is unbiased thus it will be a Random sample thus option (A) is correct.

What is sampling?

Sampling is collecting some items in a lot randomly to predict opinions about the lot.

For example; the Selection of goods, selection of people

Sampling is a useful technique because if we do it for all samples then it will take time and cost as well.

As per the given,

The cards have different names and are put into a bag.

Since no group and same name are written on the cards thus it will be a purely unbiased situation.

Thus, it will be a random sample.

Hence "The event that was picked from the bag is unbiased thus it will be a Random sample".

To learn more about sampling,

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DOES ANYONE PLEASE KNOW? ANSWER IF YOU KNOW PLEASE

Answers

Answer:

The first equation.

Step-by-step explanation:

Answer:

m = -12.50, b = 1,500; The first option.

Step-by-step explanation:

To figure out the slope I used the equation, y1 - y2 / x1 - x2, to get the answer -12.50.

For the y-intercept ( b ), I just looked at the data table and where there was a zero in the X side of the Y there would be the, b, or y-intercept.

Evaluate
3
(
3
x
−
y
)
2
−
7
z
for
x
=
2
,
y
=
5
, and
z
=
6
.

Answers

Answer:

-36

Step-by-step explanation:

PLEASE HELP ILL GIVE 5* AND THANKS

Answers

A) 32 sticks
Each time 5 sticks are added. So pattern 6 would have 25 stickers added to the original 7 sticks equaling 32 sticks

B)n=5x+7

The median age of the science teachers at Mike’s school is the same as the median age of the math teachers, but the ages of the math teachers show greater variability. Which statement most likely describes the data sets?
The difference in ages between the oldest and youngest math teachers is greater than the difference in ages between the oldest and youngest science teachers.
There are more math teachers than science teachers at Mike’s school.
The average age of the math teachers at Mike’s school is greater than the average age of the science teachers.
The oldest teacher in Mike’s school is a mathematics teacher.

Answers

Answer: A. The difference in ages between the oldest and youngest math teachers is greater than the difference in ages between the oldest and youngest science teachers.

Step-by-step explanation: on Edg 2020

Answer:

Step-by-step explanation:

HELP ME HELP HELP HELP ME

Answers

Answer:

True ( A )

Step-by-step explanation:

4 ( 5 ) - 2 = 2 ( 5 ) + 8

20 - 2 = 10 + 8

18 = 18

This is a correct statement because 18 does equal 18

True

First add 2 to both sides

4x=2x+10

Then subtract 2x from both sides

2x=10

Now divide 2 from both sides

x=5

Therefore it’s true

The diagram shows a triangle.
490
880
What is the value of v?
V =

Answers

Answer:

43°

Step-by-step explanation:

The first thing you should do is make the equation. We should know that the sum of all the angles is 180. So it should look like this...

[tex]49+88+x=180[/tex]

Combine like terms:

[tex]137+x=180[/tex]

Subtract the 137 on both sides:

[tex]x= 43[/tex]

That's it the value of v is 43°.

Answer:

the answer is 43

Step-by-step explanation:

this is so simple

the first thing that u have to remember or there is a rule

the rule is : that all the three angels added up equal to 180 degrees

so that means 88+49+v=180

88+49+v=180 first combine like terms

137+v=180 now subtract both sides by 137

v= 43

ANSWER CHECK

88+49= 137

137+ 43= 180

A parking garage charges $2.00 for the first hour and $0.75 for each additional hour. If a customer gave the parking attendant $35 for parking from 10 AM to 3 PM, how much did the garage charge?
Which piece of information is not necessary to solve the problem?
$2.00 parking charges for the first hour
$0.75 parking charges for each additional hour
Amount of time the customer was parked
$35 the customer gave the parking attendant

Answers

$35 the customer gave the parking attendant

Niki Brought a patio set on sale for $480 the original price was $850 what was the rate of discount

Answers

If Niki Brought a patio set on sale for $480 the original price was $850, then the rate of discount is 43.52%

Given,

The original price = $850

The selling price = $480

We know discount amount is the difference between the original price and selling price

Discount amount = Original price - Selling price

Substitute the values in the equation

Discount amount =850-480

= $370

Then the discount percentage = (Discount amount ÷Original price )×100

Substitute the values in the equation

Discount percentage= [tex](\frac{370}{850})100[/tex]

=43.52%

Hence, if Niki Brought a patio set on sale for $480 the original price was $850, then the rate of discount is 43.52%

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PLS HELP!! ASAPPPPPPPP

Answers

Keep the denominator

please help if u can!!

The entry fee to a fun park is $20. Jackson spent a total of 35 at the park. If z represents the number of rides jackson went on, which equation represents the situation and what is the value of z that makes the equation true?

A= 2.50=35
x=14

B= 2.50z=20
x=8

C= 20z+2.50=35
c=2

D= 20+2.50z=35
x=6

Answers

Answer: The answer is d.

Step-by-step explanation:

If the entry amount is $20 then you want to subtract $20 from $35 and that leaves you with $15 now if you divide $15 in $2.50's you get 6

Select each type of special quadrilateral that can meet the given condition.
Perpendicular Diagonals

Answers

Step-by-step explanation:

To find quadrilateral's you need to find shapes with edges.

Quadrilateral's:

Square

Rectangle

Isosceles Trapezoid

The shape of quadrilateral ''Kite'' has Perpendicular Diagonals.

What is an expression?

Mathematical expression is defined as the collection of the numbers variables and functions by using operations like addition, subtraction, multiplication, and division.

Given that;

The condition is,

''Perpendicular Diagonals''

Now, We know that;

Kite has Perpendicular Diagonals.

Hence, The shape of quadrilateral ''Kite'' has Perpendicular Diagonals.

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Solve each equation mentally. a. 5/2 x ? = 1

Answers

Answer:

1 is the answer why because its multiply both side 1

A number is divided by four. The result is added to five. This result is multiplied by three to give 27. What is the number?

Answers

The answer is 16

Explanation:16/4=4

4+5=9

9*3=27

Answer:

x=16

Step-by-step explanation:

We'll say that x represents the number.

3([tex]\frac{x}{4}[/tex]+5)=27 given equation

[tex]\frac{3x}{4}[/tex]+15=27 distributive property

3x/4=12 subtract

3x=48 multiply

x=16 divide

write in standard from 8*1 +5*1/100 +9*1/1000

Answers

Answer:

8*1=8

5*1/100= 0.05

9*1/1000= 0.009

then 8+0.05+0.009= 8.059

I need help please!:D

Answers

Answer:

a 80

Step-by-step explanation:

7200 / 90 = 80

write in words international system: 708,195

Answers

Answer:

Seven hundred eight thousand one hundred ninety-five.

Answer:

708,195

Step-by-step explanation:

well I think it's seven hundred and eighty thousand one hundred and ninety five

find the area of shaded region length 14cm breadth 14 cm

Answers

there is somthin more you need to say like for example that the thing in the middle is a circle

if i assume that it is a circle than the answer is this

(14×14)-(3.14)²×r r=7 cm the half of 14 cm

196-(3.14)²×7

196-9.9×7

196-69

127cm²

2. Identify the property of equality that justifies the missing step to solve the given equation

Answers

Answer:

Subtraction property of equality

Step-by-step explanation:

Given the equation;

2x + (x+5) = 41

open the parenthesis;

2x+x + 5 = 41 (Associative property)

3x+5 = 41

Subtract 5 from both sides

3x + 5 = 41

3x + 5- 5 = 41 - 5 (Subtraction property of equality)

3x = 36

Divide both sides by 3;

3x/3 = 36/3

x = 12 (Division property of equality)

Hence the required property is Subtraction property of equality

How can I simplify this?

Answers

Answer: [tex]\frac{\text{x}^{2n}-1}{\text{x}^n}[/tex]

This is equivalent to [tex]\frac{(\text{x}^{n}-1)(\text{x}^{n}+1)}{\text{x}^n}[/tex]

See the attachment below for the steps.

can someone please help me with these two questions! :( ill mark u as brainlest

Answers

Answer:

1.A by SSS axiom

2.F as angle A is 62*

4.5 m
10
8
15 m
4.5 m
10 m

Answers

Answer:

242.5m2

Step-by-step explanation:

base of triangle=4.5m+4.5m+10m

=19m

area of triangle = 1/2 x 19mx15m

=142.5m2

area of square=10mx10m

=100m2

total area=100m+142.5m

=242.5m2

What is the equation of the line that passes through the point (5,2) and has a slope
of –6/5

Answers

Answer:

5y+6x-40=0

Step-by-step explanation:

y-2=-6/5(x-5)

5y-10=-6(x-5)

5y-10=-6x+30

5y+6x-10-30=0

5y+6x-40=0

What is the answer for the question

Answers

It’s D since it’s the only one where every element of every group is connected

Solve 4x - 7y ( x = 6, y = -4 ) *

Answers

[tex]4x-7y[/tex]

[tex]4(6)-7(-4)[/tex] ↦ Substitute given coordinate points in the equation (x = 6 and y = 4.)

[tex]24-(-28)[/tex] ↦ Multiply the number.

[tex]24+28[/tex] ↦ Negative multiply Negative will always be positive.

52 ↦ Answer.

Answer:

Step-by-step explanation:

4(6) = 24 and -7(-4) = 28

28+24=52

A tube has a radius of 9 inches and a height of 7 inches. What's its approximate volume?

Answers

Answer is 1780 cubic inches

Volume of a tube (cylinder) is
V= pi x radius^2 x height

V = 3.14 x 9^2 x 7

V = 3-14 x 81 x 7

V = 1780 inches cubed

........-.--
Emma's family tooka road trip to Niagrara Falls. Emma slept through the last 21% of
the trip. If the total length of the trip was 600 miles, how many miles had they
travelled when Emma fell asleep?

Answers

Answer:

the last 126 miles emma slept

What is the reciprocal of 5 in fraction

Answers

Answer:

The reciprocal of 5 is 1/5. Every number has a reciprocal except for 0. There is nothing you can multiply by 0 to create a product of 1, so it has no reciprocal. Reciprocals are used when dividing fractions.

Hope this helps have a good day and God bless! <3

What is the sign of the product (-5)(-3)(-8)(-6)? (5 points)

Answers

Answer:

750

Step-by-step explanation:

brainliest please

Answer: positive

Step-by-step explanation:

two negatives equals a positive

the ratio of hotdogs to hamburgers is 8:3. if 272 hotdogs were sold how many hamburgers were sold.

Answers

Answer:

102 hamburgers

Step-by-step explanation:

Hotdogs: 8 272

Hamburgers: 3 HB

8/3=272/HB

3*272=8HB

816=8HB

HB=102

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x2 - 81 = 0 What is x2

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x2 - 81 = 0

What is x2