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
Marta_Voda [28]
3 years ago
9

What is ( - 7 ) times ( - 3 )

Mathematics
2 answers:
PtichkaEL [24]3 years ago
6 0
The answer is 21 because the negatives cancel out
tankabanditka [31]3 years ago
3 0

(-7) times (-3) is 21


You might be interested in
Find the common ratio and an explicit form in each of the following geometric sequences.
Margaret [11]

Answer:

The explicit form is a_{n}=162(2/3)^{n-1}

Step-by-step explanation:

The explicit form of a geometric sequence is given by:

a_{n}=ar^{n-1}

where an is the nth term, a is the first term of the sequence and r is the common ratio.

In this case:

a=162

The value of the common ratio is obtained by dividing one term by the previous term.

For the first and second terms:

108/162=2/3

For the second and third terms (In order to prove that 2/3 is the common ratio)

72/108=2/3

Therefore:

r=2/3

Replacing a and r in the formula:

a_{n}=162(2/3)^{n-1}

7 0
3 years ago
The base of a prism has n sides. Find the numbers of faces, edges, and
Harman [31]

Answers:

  • faces = n+2
  • edges = 3n
  • vertices = 2n

===========================================================

Explanation:

Think of a hexagonal room with n = 6 walls, i.e. the floor is a hexagon with n = 6 sides. The floor and ceiling are parallel to each other, and congruent hexagons. That's 2 faces so far. Then we have another 6 faces to account for the walls. This gives 2+6 = 8 faces of a hexagonal prism.

In more general terms, a prism with a base of n sides will have 2 parallel and congruent base faces, and n walls or lateral faces. This gives n+2 total faces.

------------------------

Let's go back to the hexagonal prism. The floor has 6 sides to it, and so does the ceiling. We have 6+6 = 12 edges so far. Then we have another 6 edges where each of the rectangular walls meet up. That gives 12+6 = 18 edges total of this hexagonal prism room.

For any more general case, each base has n sides. That gives 2n sides so far for just the bases. Then add on another n for the lateral edges and we get 3n total edges.

--------------------------

Once again lets revisit the room with the hexagonal floor and ceiling. The floor has 6 vertices and the ceiling has the same vertex count. Therefore, this prism has 6+6 = 12 vertices.

For the general case, each base has n vertices. There are 2 such identical bases giving 2n vertices total.

---------------------------

One way to check the answer:

We could use Euler's Polyhedron Formula which is

F+V-E = 2

where,

  • F = number of faces
  • V = number of vertices
  • E = number of edges

For the hexagonal prism we found

  • F = 8
  • V = 12
  • E = 18

Then notice how

F+V-E = 2

8+12-18 = 2

20-18 = 2

2 = 2

This confirms the formula works for a hexagonal prism.

Now let's check it for the more general case

We found earlier that,

  • F = n+2
  • V = 2n
  • E = 3n

So,

F+V-E = 2

n+2+2n-3n = 2

3n-3n+2 = 2

0n+2 = 2

0+2 = 2

2 = 2

This helps confirm the answer for any prism with the base of n sides.

4 0
2 years ago
Find the system of x.​
marissa [1.9K]

Answer:

61 degrees

Step-by-step explanation:

A right angle equals 90 degrees.

90-29= 61

6 0
2 years ago
Read 2 more answers
Factoring quadratic with a common factor Factor completely 2x^2-18x+36
rodikova [14]

Answer:

2 {x}^{2}  - 18x + 36 \\ 2 {x}^{2}  - 12x - 6x + 36 \\ 2 x(x - 6) - 6(x - 6) \\ (2x - 6)(x - 6)

6 0
3 years ago
Judy has $10 to buy watermelons and grapes. Judy plans to buy two watermelons that cost $6 and as many pounds of grapes as she c
lawyer [7]
Judy can buy at least 5 pounds of grapes.
4 0
3 years ago
Other questions:
  • (will give brainliest)
    9·1 answer
  • Which best explains what determines whether a number is irrational?​
    8·1 answer
  • 9. Find the point from Y to X that is 3/4 of YX.
    5·2 answers
  • To find the height of the Eiffel Tower, Antoine placed a mirror of 500 meters away from the tower. He then positions himself so
    12·1 answer
  • Figure 1 is similar to figure 2
    6·2 answers
  • A researcher wants to study exercise as a way of reducing anger expression. He plans to throw water balloons at participants, me
    7·1 answer
  • Part 2: Use the information provided to write the standard form equation of each circle
    5·2 answers
  • PLEEEASEE HELP <8888
    11·1 answer
  • PLEASE HELP!! I WILL MARK BRAINLIST
    13·1 answer
  • Please take a look at the picture. Please write your answer with an explanation.
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!