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
adoni [48]
3 years ago
13

How to subtractat a positive and negative rational number

Mathematics
1 answer:
Anna71 [15]3 years ago
5 0

Answer:

<em>75</em>

Step-by-step explanation:

Subtracting a number means adding the opposite.

The opposite of a number is the number you obtain by just changing the sign.

The opposite of 5 is -5. The opposite of 100 is -100. The opposite of -4.5 is 4.5. The opposite of 0 is 0. Zero is the only number that is equal to its opposite.

You need to subtract -45, so add the opposite of -45 which is 45.

30 - (-45) = 30 + 45 = 75

You might be interested in
Look at the picture
ValentinkaMS [17]

Answer: 54

Step-by-step explanation:

3 times the square of -3 plus -5 times -3 plus 12

3 times 9 + 15 + 12

27+15+12=

54

7 0
3 years ago
A ferry departs from a port along the Sands River at 10:00 am. The ferry travels at a speed of 15 mph in still water and returns
jek_recluse [69]

Answer:

Speed of river's current = 5 mph

Step-by-step explanation:

Let 'd' be the distance covered  

 Let x be the speed of the rivers current

Speed upstream = 15-x

speed downstream = 15+x

Time = distance / speed

time upstream = \frac{d}{15-x}

time downstream = \frac{d}{15+x}

the ferry trip upstream takes twice as long as its return trip downstream

\frac{d}{15-x}= \frac{2d}{15+x}

divide both sides by d

\frac{1}{15-x}= \frac{2}{15+x}

cross multiply

15+x= 2(15-x)

15+x= 30-2x

Add 2x on both sideds

15+3x= 30

subtract 15 from both sides and divide by 3

3x=15

x=5

Speed of river's current = 5 mph

8 0
3 years ago
I have 6.5 yards of fabric and if the fabric costs $3.99 per yard how much will I spend
Masteriza [31]

Answer: You will spend 25.94$

Step-by-step explanation:

6.5 yards by 3.99 per yard = 6.5 times 3.99 = 25.935 witch rounds too 25.94$

4 0
2 years ago
Read 2 more answers
Similar triangle question
marishachu [46]

Answer:

thats a 90 degrees angle

5 0
3 years ago
PLEASE HELP ME!!!
agasfer [191]
Your answer is 5/6.
1. make the denominators the same as the LCD
1/6+(2*2/3*2)
2. simplify. denominators are now the same
1/6+4/6
3. join the denominators
1+4/6
4. simplify
5/6
tell me if u have any more questions
6 0
3 years ago
Read 2 more answers
Other questions:
  • Simplify Each expression below. follow your integer and check the sign of your answer. 3*(-4)
    9·2 answers
  • Solve for n. 3 (n 5) ≥ 3n 8 a. no solution b. n ≥ 23 c. n ≥ 7 d. all real numbers
    15·2 answers
  • Line m is perpendicular to line n. Which statement about lines m and n is true
    14·1 answer
  • A land surveyor measured the elevations of four villages. His measurements are shown.
    15·2 answers
  • Plzzzzzzzzzz Hurry I will mark brainliest if you get it right
    11·1 answer
  • Which shows the solution in the inequality? -2x &gt; 18
    13·1 answer
  • Please help these are the last 3 I need help on. I will mark brainliest if it lets me
    6·1 answer
  • Write an expression using fractions to show how to determine the amount that each person will pay? Then calculate each person's
    9·1 answer
  • Find the size of the angle marked a and b on the diagram
    7·2 answers
  • I’m really confused please help me
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!