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
The measurements of 11 fish caught during an angling competition are recorded.
stepladder [879]

Answer:

Step-by-step explanation:

A) = (35,?)

B) = POSITIVE

C) = 601

7 0
3 years ago
The area of a circle is 360.9. Find the radius of the circle. (Round to 2 decimal places.)
Ksju [112]
The radius of a circle is a=pi r^2.
so 360.9=3.14r^2, so that's around 114.94=r^2
r=10.72
4 0
3 years ago
Ms. Bergstedt asked two students to come up with two different sequences. Jay created this sequence: The first term is 4 and eac
kumpel [21]
I think you subtract in both.

8 0
3 years ago
Read 2 more answers
The population of a city (in millions) at time t (in years) is P(t)=2.6 e 0.005t , where t=0 is the year 2000. When will the pop
lora16 [44]

Answer:

  year 2139

Step-by-step explanation:

The population will double when the factor e^(.005t) is 2.

  e^(.005t) = 2

  .005t = ln(2)

  t = ln(2)/0.005 = 138.6

The population will be double its size at t=0 when t=138.6. That is the population will be about 5.2 million in the year 2139.

7 0
3 years ago
If b = 7 and A = 80 degrees,<br> find c.
bixtya [17]

Answer:

Step-by-step explanation:

7/sin10=c

c=40.31

6 0
3 years ago
Other questions:
  • If the temperature is at 6 and it rises to 22 what is the temperture
    14·1 answer
  • Describe how making a list that can help you solve a math problem. write a problem that could be solved by making a list
    15·1 answer
  • Falando de força/pressão, você precisa prensar as 20 peças de PD/116, ao levantar as informações do processo, você percebe que a
    7·1 answer
  • Fill in the blank.
    14·2 answers
  • What's 5/8 decimal and a percent
    11·2 answers
  • How would u factorise these?!?
    14·2 answers
  • What Number is X in this equation?<br><br> 6 ÷ 2( 1 + 2 ) = X
    13·2 answers
  • The admission ticket for Pat Pat Zoo is $1.50 for children and $4.00 for adults. On a certain day, 2200 people went to the zoo a
    15·1 answer
  • If terrance ran 12mph and jesse ran 8mph how long will it take them to run 50 miles
    11·1 answer
  • A biologist took a count of the number of migrating waterfowl at a particular lake, and recounted the lake's population of water
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!