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
lesantik [10]
2 years ago
7

21. What must be added to -9 to have a sum of 20?

Mathematics
2 answers:
Inga [223]2 years ago
7 0

Answer:

21C

22D

23B

24C

25A

Step-by-step explanation:

sleet_krkn [62]2 years ago
7 0

Answer:

21) c)29

22) d)57

23) b)-321

24) c)70

25) a)-10

explanation

let the unknown answer be x

21) x+(-9)=20

x-9=20

x=20+9

x=29

22)45-(-12)=x

45+12= 57

23)x×123 = -39483

x= <u>-39483</u>

123

x= -321

24) (30×3)+(-2×10)

90+(-20)

90-20=70

25) 5×-2=-10

You might be interested in
which unit of measure would be appropriate for the volume of a cylinder that is 8 meters and has a radius of 4 meters
Nastasia [14]
The unites to measure the volume of an object is what ever units you’re using cubed
3 0
3 years ago
What is the mesure of
lara [203]
What are we measuring
4 0
3 years ago
sally has a part time job mowing lawns so she can save money for a new car. she charges $5 per hour define the independent and d
KengaRu [80]

Answer:

Independent: Amount of hours she works

Dependent: Amount of money she makes

Step-by-step explanation:

The independent variable is the part of the equation that changes. In this case the only thing that changes is how long she works, the amount of money she charges and what she is doing does not change.

The dependent variable is what you measure in the equation. In this case, the amount of money she makes <em>depends</em><em> </em><em>on</em> the amount of time she works.

8 0
3 years ago
8x + 4 = 7(x+3)<br> I have to solve this and I have no clue how to solve it..can someone help me?
Lena [83]

Answer:

x = 17

Step-by-step explanation:

8x+4=7(x+3) - Equation

8x+4=7x+21 - Distribute the 7

8x-7x=21-4  - Isolate the x

x=17 - Answer

4 0
3 years ago
What are two solutions of 3 + 4 |x/2 + 3| = 11?
Alex
3 + 4abs(x/2 + 3) = 11 Subtract 3
4 abs(x/2 + 3) = 11 - 3
4 abs(x/2 + 3) = 8 Divide by 4
abs(x/2 + 3) = 8/4
abs(x/2 + 3) = 2

Solution 1
x/2 + 3 = 2 Subtract 3
x/2 = 2 - 3
x/2 = - 1 Multiply by 2
x/2 *2 = - 2
x = - 2

Solution 2
x/2 + 3 = - 2
x/2 = - 2 - 3
x/2 = - 5 Multiply by 2
x = -5 * 2
x = -10

Solutions
x = - 2 <<<< answer 1
x = -10 <<<< answer 2

3 0
3 years ago
Other questions:
  • If a sequence us defined recursively by f(0)= 3 and f (n+1)= -f (n) +5 for n&gt;_ 0 then f (2) is equal to?
    14·1 answer
  • If (9x − 4)(9x + 4) = ax2 − b, what is the value of a?<br><br> The value of a is _____________.
    9·1 answer
  • I need a lot of help please! Giving out lots of points!
    14·2 answers
  • What is fifteen percent of seventy dollars
    9·2 answers
  • Imagine each letter of the word mathematical is written on idividual pieces of paper and placed in a bag. should you pick a rand
    13·1 answer
  • A basketball team scored 78 points in a game. The players made 6 baskets worth 1 point each and 27 baskets worth 2 points each.
    8·1 answer
  • using compound interest, how long does it take to double a 1000 dollar investment that pays 6.5% annual interest, compounded mon
    9·1 answer
  • Solve for x: 5x-34 = 2x-4
    13·1 answer
  • BRAINLIEST Please help i'd appreciate it thanks, Have a nice day :)
    15·1 answer
  • it takes Cynthia 12 hours to proof a chapter of Hawkes Learning Systems' Intermediate Algebra book and it takes Phillip 3 hours.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!