1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
polet [3.4K]
3 years ago
13

The perimeter of a trapezoid is 39a – 7. Three sides have the following lengths: 9a, 5a + 1, and 17a – 6. What is the length of

the fourth side?
A. 12
B.a – 7
C. 8a – 2
D.31a – 5
Mathematics
2 answers:
Pie3 years ago
6 0

Answer: 8a-2

Step-by-step explanation:

The perimeter of a trapezoid is the addition of its four sides.

Perimeter of trapezoid= 39a – 7.

Length of 1st side= 9a,

Length of 2nd side= 5a + 1,

Length of third side= 17a – 6.

Length of the fourth side= Unknown

To find the length of the 4th side, we add the length of the three sides together and subtract from the perimeter of the trapezoid. This will be:

= 39a-7 - (9a+5a+1+17a-6)

= 39a-7-(9a+5a+17a+1-6)

= 39a-7-(31a-5)

=39a-7-31a+5

= 39a-31a-7+5

= 8a-2

The length of the 4th side is 8a-2

Airida [17]3 years ago
3 0
We know the perimeter is the total sum of all sides of the shape, we can use this to form an equation: the perimeter=1st side + 2nd side + 3rd side + 4th side 39a-7=9a+(5a+1)+(17a-6)+4th side.
Collect like terms to get 39a-7=31a-5+4th side
If we move everything but the 4th side over to the left we can solve 
C. 8a-2=4th side is the correct answer
You might be interested in
I need to get in helppppppppppp<br> #9
Soloha48 [4]
Start off with yes and say how school work is a priority for you and you’d be willing to put in the dedication
5 0
3 years ago
Thirty times the square of a non-zero number is equal to 8 times the number. What is the number?
astra-53 [7]
Hello here is a solution :

4 0
3 years ago
Find the vertical component given that R = 42 lb. and = 80.<br><br> 41.36<br> 7.29<br> 59.45
valentina_108 [34]

Answer:

a

Step-by-step explanation:

3 0
2 years ago
Solve the equation by completing the square. Round to the nearest hundredth if necessary. x2 – x – 7 = 0
Tanzania [10]
2x-x-7=0

3x-7=0

add 7 to 7 and 0, so then we cross out 7-7, and then

3x=7, bc u change the subtraction to addition, sr if thst doesn't make sense but 3x=7 is the answer
8 0
3 years ago
Read 2 more answers
What is the volume of this cone?
olchik [2.2K]

Answer:

The volume of the cone is approximately 453.0 cm³

Step-by-step explanation:

The volume of a cone is one third that of a cylinder with the same height and radius.  That gives us  1/3 πr²h, where r is radius and h is height.

However, we are not given the height of the cone, but the side length.  We can work out the height using the Pythagorean theorem, as we have a right triangle with the height, base radius, and length.  You may recall that the Pythagorean theorem states that the square of the hypotenuse of a right triangle is equal to the sum of the squares of it's other two sides:

a^2 = b^2 + c^2

So we can find the height of the cone with that:

10.8^2 = 7.4^2 + h^2\\h^2 = 10.8^2 - 7.4^2\\h^2 = 116.64 - 54.76\\h^2 = 61.88\\h = \sqrt{61.88}\\h \approx  7.9

Now that we have the cone's height, we can solve for its volume:

v = \frac{1}{3} \pi r^2 h\\v = \frac{1}{3} \pi \times 7.4^2  \times 7.9\\v = \frac{1}{3} \pi \times 54.76 \times 7.9\\v = \frac{1}{3} \pi \times 432.6\\v = \pi \times 144.2\\v \approx 453.0 cm^3

5 0
3 years ago
Read 2 more answers
Other questions:
  • Using the following two points, find the slope: ( -1, 5 ) and ( 2, -3 ).
    5·1 answer
  • 4abc + (-9abc) + 10d?
    15·2 answers
  • Write a function rule that represents the sentence.
    11·2 answers
  • 50 points!!! please have serious answers
    11·1 answer
  • Which one of these are a inequality
    6·1 answer
  • This question is based on the following poem season and celebrations
    15·1 answer
  • I need 1 more credit to pass my class! Please Help! <br> I will give brainliest If your right.
    9·1 answer
  • Angle x has a measurement of
    14·1 answer
  • The x coordinates of the point where 2y-x=10 intersect the line y=3x​
    7·1 answer
  • why was everyone laughing? And if she said “after the ban”, does that mean past tense or future tense? Please explain
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!