8 9 and 10 please will mark brainliest!

Answer:

$12

Step-by-step explanation:

Money spent by Tracy = 3x - 20

3x - 20 = 16       {add 20 to both sides}

       3x = 16 + 20

      3x  = 36        {Divide both sides by 3

       x = 36/3

x = 12

Money spent by Daniel = $12

Answer:

20 x 57^x / 10^x

Step-by-step explanation:

Answer:

Volume = 42 units^2

x = 5 units

Total Surface Area = 96 units

Step-by-step explanation:

Volume

V = bh, where b = 1/2 * 3 * 4 and h = 7,

= 6 * 7 = 42 units^2

x

You can solve for this variable by using the pythagorean theorem;

a^2 + b^2 = c^2, where a = 3 and b = 4,

9 + 16 = x^2

= 25 = x^2

= x = 5 units

Total Surface Area

You can solve this by multiplying the perimeter of the base (3 + 4 + 5) by the height and adding that to two times the area of the base:

7 * (3 + 4 + 5) + 2(1/2*3*4)

= 7*12 + 12

= 96 units

Answer:

A

Step-by-step explanation:

The sum of the 3 angles in a triangle = 180°

sum the 3 angles and equate to 180

5x - 6 + 89 + 57 = 180 , that is

5x + 140 = 180 ( subtract 140 from both sides )

5x = 40 ( divide both sides by 5 )

x = 8 → A

Answer:

In order to calculate perimeter, you need to add together the lengths of all four sides of the square. You are given the length of one side. Remember, all sides of a square are equal, so really you already have the measures of each side. Then, you add them together, so 6 + 6 + 6 + 6 = 24 inches.

Step-by-step explanation:

To find the perimeter of a rectangle, add the lengths of the rectangle's four sides. If you have only the width and the height, then you can easily find all four sides (two sides are each equal to the height and the other two sides are equal to the width). Multiply both the height and width by two and add the results.

Answer:

16

Step-by-step explanation:

P=2(L+W)

=2(6+2)

=16

Answer:

16.4200739.....

Step-by-step explanation:

this full explanation is in Calculator

..

Answer:

c

Step-by-step explanation:

AND DONT DELETE MY ANSWERS THEY KEEP ON GETTING DELETED IM JUST HELPIING

Answer:

12kr^7

Step-by-step explanation:

Answer:

1

7

11

Step-by-step explanation:

Those are the answers

Answer:

Nancy will be 32 and Khaled will be 16

Step-by-step explanation:

3 years ago Nancy was more than 2 so lets start with 2. To get back to present each year x2 meaning 3 x 2=6 and add the 2 so thats 8. Now the 4 more years is 4x2 which is 8. 8+8=16 and then twice Nancy's age is 16x2: Nancy is 32 and Khaled is 16

Answer:

Move all terms to the left side of the equation and simplify.

3x²−12x−21=0

Use the quadratic formula to find the solutions.

(−b±√b²−4(ac))/2a

Substitute the values a=3, b=−12, and c=−21 into the quadratic formula and solve for x.

(12±√(−12)²−4⋅(3⋅−21)0/2⋅3 Simplify =>  x=2±√11

The result can be shown in multiple forms.

Exact Form: x=2±√11

Decimal Form: x=5.31662479…,−1.31662479…

Step-by-step explanation:

Step-by-step explanation:

The quadratic equation is

x=−b=−√b2−4ac2a

for a quadratic taking the form

ax2+bx+c=0

So for this equation it is

x=−(−12)±√(−12)2−4⋅3⋅112⋅3

x=12±√144−1326

x=12±√4⋅36

x=6±√33

Answer:

8c - 40

Step-by-step explanation:

8(c - 5)

8c - 8×5

= 8c - 40

Hi, let me help you out!

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We'll use the Distributive Property to simplify.

This property states that

[tex]\longrightarrow\tt{a(b+c)=ab+ac}[/tex]

In this little formula, a, b, and c can be variables, constants, or both.

Now we simplify:

[tex]\longrightarrow\tt{8(c-5)}[/tex]

Multiply 8 times c and -5:

[tex]\longrightarrow\tt{8c-40}[/tex]

Hence, we conclude that the answer is [tex]\tt{8c-40}[/tex].

I hope this helps you! Have an awesome day!

If you need any explanation or clarification, comment under my answer, and I'll see what I can do to help you out and answer your questions! :D

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Answer:

r*4, m+15, 21/k, m-16, 17/g, p+24 .    tell me if this is wrong i may have another answer

Step-by-step explanation:

Answer:

ABOUT 6.3077

Step-by-step explanation:

Everything added together = 82

82 / 13 = ABOUT 6.3077

Answer:

y= (C-Ax)/B hence:y=(6x+9)/5

gradient (m)= 6/5

y-intercept:9/5

Answer:

because when x ing a positive to a negative it will give you a negative however if you x a negative and a negitive it will give a positive

Step-by-step explanation:

Answer:

269 in³

Step-by-step explanation:

The formula for the volume of a sphere is V = (4/3)πr³.

Here the ball (sphere) diameter is 8 in, meaning that the radius is 4 in.

Thus, the volume of this ball is:

V = (4/3)π(4 in)³

If an "estimate" is good enough, use 3.14 for π:

V = (4/3)(3.14)(4 in)³  =  269 in³

Answer:

1.  3*2/3=6/9

2. 2*3/2=6/4 I have no idea right now

Step-by-step explanation:

sorry about number 2 :(

Answer: 2 is D

Step-by-step explanation:

Answer:

0.064

Step-by-step explanation:

Given are..

30

9

17

7

Operation to use..

Addition and Subtraction

Solution:

9 + 17 = 26

30 - 26 = 4

4 + 7 = 11

so in that case there are 11 student chosen randomly from the class has a brother and a sister.

The probability  that a student chosen randomly from the class has a brother and a sister would be; 11/30

Probability refers to a possibility that deals with the occurrence of random events.

The probability of all the events occurring need to be 1.

The formula of probability is defined as the ratio of a number of favorable outcomes to the total number of outcomes.

We are given that class of 30 students, 9 have a brother and 17 have a sister. There are 7 students who have a brother and a sister.

Therefore, we have 9 + 17 = 26

Total students

30 - 26 = 4

4 + 7 = 11

As we can see that there are 11 student chosen randomly from the class has a brother and a sister;

Probabilty = 11/30

Learn more about probability here;

https://brainly.com/question/9326835

#SPJ2

Answer:

ths for the points TEHEHEHEHE

Step-by-step explanation:

Answer:

P = 12x - 18, x = 7 feet

Step-by-step explanation:

We know that the formula for the perimeter of a rectangle is:

[tex]P=2l+2w[/tex]

Where l is the length and w is the width. So we just substitute in for variables:

P = 2 (5x - 7) + 2 (x - 2)

We distribute by foiling:

P = 10x - 14 + 2x - 4

Then combine like terms:

P = 12x - 18

This can be further factored to 6(2x - 3) if needed.

Since we know the expression for perimeter, we can just set it equal to 66 feet, like this:

6(2x - 3) = 66

Divide both sides by 6:

2x - 3 = 11

Add 3 to both sides:

2x = 14

Divide both sides by 2:

x = 7 feet

Answer:

Step-by-step explanation:

1.

Base area = πr² = 6²π = 36π in²

Circumference = 2πr = 12π in

Lateral area = 2πrh = 144π in²

Total surface area = 2×36π + 144π

= 216π in²

2.

Base area = πr² = π3.25² = 10.5625π in²

Circumference = 2πr = 6.5π in

Lateral area = 2πrh = 6.5π×6.2 = 40.3π in²

Total surface area = 2×10.5625π + 40.3π = 61.425π in²

Answer:

x=5

Step-by-step explanation:

-4x + 8 = -12

-4x = -12-8

-4x = -20

x = -20÷-4

x = 5

Answer:

6 m/s

15 seconds

Step-by-step explanation:

Speed = distance / time

54 / 9 = 6 m/s

Given the same speed, we can determine the time she would use to travel

time = distance / speed = 90 / 6 = 15 seconds