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
bija089 [108]
3 years ago
5

3. Which expression is equivalent to 0? A. O a+(-a) B.O a-(-a) C. (a)(-a) D.

Mathematics
1 answer:
garik1379 [7]3 years ago
5 0
A. a + ( - a)

Because it’s the same thing as: a - a

And if you plug in any value for example:
2 - 2 that would be 0
You might be interested in
Investors buy a studio apartment for 120000 of this amount they have down payment of 24000 their down payment is what percent of
Yakvenalex [24]

Answer:

1. 20%

2. 40%

Step-by-step explanation:

To find the percent of the total payment that the down payment is we have to you use the following equation:

\frac{part}{whole} * 100 = percent

Lets start plugging things into the equation.

The part is equal to the down payment and the whole is the total cost of the studio apartment.

Let's do this for the first question

\frac{24,000}{120,000} * 100 = 20%

So we see that 24,000 is 20% of the total purchase price!

Let's do this for the next question:

\frac{48,000}{120,000} * 100 = 40

48,000 is 40% of the 120,000 total cost!

<em>Hope this helps!</em>

<em>- Kay</em>

<em />

7 0
3 years ago
NO LINKS!!
dexar [7]

Answer: Anything between 0 and 10, excluding both endpoints.

In terms of symbols we can say 0 < w < 10 where w is the width.

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

Explanation:

You could do this with two variables, but I think it's easier to instead use one variable only. This is because the length is dependent on what you pick for the width.

w = width

2w = twice the width

2w-5 = five less than twice the width = length

So,

  • width = w
  • length = 2w-5

which lead to

area = length*width

area = (2w-5)*w

area = 2w^2-5w

area < 150

2w^2 - 5w < 150

2w^2 - 5w - 150 < 0

To solve this inequality, we will solve the equation 2w^2-5w-150 = 0

Use the quadratic formula. Plug in a = 2, b = -5, c = -150

w = \frac{-b\pm\sqrt{b^2-4ac}}{2a}\\\\w = \frac{-(-5)\pm\sqrt{(-5)^2-4(2)(-150)}}{2(2)}\\\\w = \frac{5\pm\sqrt{1225}}{4}\\\\w = \frac{5\pm35}{4}\\\\w = \frac{5+35}{4} \ \text{ or } \ w = \frac{5-35}{4}\\\\w = \frac{40}{4} \ \text{ or } \ w = \frac{-30}{4}\\\\w = 10 \ \text{ or } \ w = -7.5\\\\

Ignore the negative solution as it makes no sense to have a negative width.

The only practical root is w = 10.

If w = 10 feet, then the area = 2w^2-5w results in 150 square feet.

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

Based on that root, we need to try a sample value that is to the left of it.

Let's say we try w = 5.

2w^2 - 5w < 150

2*5^2 - 5*5 < 150

25 < 150 ... which is true

This shows that if 0 < w < 10, then 2w^2-5w < 150 is true.

Now try something to the right of 10. I'll pick w = 15

2w^2 - 5w < 150

2*15^2 - 5*15 < 150

375 < 150 ... which is false

It means w > 10 leads to 2w^2-5w < 150  being false.

Therefore w > 10 isn't allowed if we want 2w^2-5w < 150 to be true.

4 0
2 years ago
Math question please show work
garik1379 [7]

You calculate this using the Cosine Rule

x^2 = 60.5^2 + 226^2 - 2*60.5*226 cos 39

= 33484.42

x = 182.98

He threw the ball approximately 183 feet.

7 0
2 years ago
Adding integers to add integers we can think of a football field <br> 8 + -2=
zaharov [31]

Answer:

6

Step-by-step explanation:

I learned this last year

7 0
3 years ago
Read 2 more answers
PLEASE HELP!
IrinaVladis [17]
The answer would be C. $27.20
7 0
3 years ago
Read 2 more answers
Other questions:
  • In circle O, AC and EB are diameters the measure of arc DC is 50. what is the measure of EBC
    8·2 answers
  • Complementary angles equal 90 degrees true or false
    5·1 answer
  • Line a is parallel to line b. Which statement about lines a and b is true?
    8·2 answers
  • 1) $400 interest is earned on a principal of $2,000 at a simple interest rate of 5%
    9·1 answer
  • Urgent!!!
    5·2 answers
  • John has a 6 inch cuck gwen has 4 inch deep_______ how much of johns cuck is sticking out?
    14·2 answers
  • The perimeter of a rectangular-shaped garden is 40 meters. Let w represent the width of the garden in meters. What does the expr
    12·1 answer
  • Which method describes the inventory process in which the last items to be
    10·2 answers
  • 3. You have $320. You want to go to the movies with your friends and each ticket costs $8. How many friends can you take and sti
    11·2 answers
  • A particular company's net sales, in billions, from 2008 to 2018 can be modeled by the expression t2 10t 68, where t is the numb
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!