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
damaskus [11]
3 years ago
9

For what value of a does (1/9)a+1 =81a+1 272-a?

Mathematics
1 answer:
AlexFokin [52]3 years ago
8 0

Answer:

-4

Step-by-step explanation:

\left( \dfrac{1}{9}\right)^{a+1}= 81^{a+1}\cdot 27^{2-a}\\\\\\(3^{-2})^{a+1}=(3^4)^{a+1}\cdot (3^3)^{2-a} \\\\\\3^{-2a-2}=3^{4a+4}\cdot 3^{6-3a} \\\\\\3^{-2a-2}=3^{a+10} \\\\\\-2a-2=a+10 \\\\\\-3a=12 \\\\\\a=-4

Hope this helps!

You might be interested in
What's the estimate of 1925 × 7​
Reil [10]

Answer:

13,500

Step-by-step explanation:

1925 x 7 = 13,475

13,475

5 and up means round up so we start at the ones place.

13,500

Hopefully this helps you :)

pls mark brainlest ;)

5 0
3 years ago
The expression 3^2*3^3*3^4 is equivalent to?<br> Show all your work please
loris [4]
Cool! So OK I'll take you through it.
You just need to take everything 1 step at a time, as you might already know.

First
3 to the second is 9

Second
The first part included like this 9*(3 to the third) which is 243

Third
The second part is included into the question like 243*(3 to the fourth) which is 243*81

Fourth
243*81 = 19,683

Your Answer
(3^2)*(3^3)*3^4) = 19,693

Hope That Helps and Correct Me If I'm Wrong!

3 0
3 years ago
Read 2 more answers
HELP ME ASAP PLEASE?!?!
miss Akunina [59]
A True

Congruent means to have the same shape and size or when we can cut them out and then match them up completely.
3 0
3 years ago
Read 2 more answers
X^2+y^2=169, 3x+2y=39 please answer using substitution and each step
Oksanka [162]

Answer:

x=13,y=0

Step-by-step explanation:

We are given a system of equations

{x}^{2}  +  {y}^{2}  = 169 -  - eqn \: 1 \\ 3x + 2y = 39 -  - eqn \: 2

For equation 1,square all terms to reduce it

√x²+√y²=169

x+y=13

Make x the subject as required by the question to use substitution method

x=13-y

Plug x=13-y into eqn 2

3(13-y)+2y=39

39-3y+2y=39

39-y=39

y=39-39=0

Plug y=0 into equation 1

x+0=13

x=0

7 0
2 years ago
There are 28 students in Ms. Annand’s class. 25% got an A on their last math quiz. How many students did not receive an A on the
Luden [163]

Answer:

21 students

Step-by-step explanation:

25% of 28 is 7 28-7=21

8 0
2 years ago
Other questions:
  • in fireside ski shop, 11/28 of the ski caps have tassals. Of the caps with tassals, 7/11 are blue. What fraction of the caps are
    14·1 answer
  • For what value of x is sin x = cos 19°, where 0°&lt; x &lt; 90°? 38°
    13·1 answer
  • When addressing an envelope for delivery in the United States or Canada, the zip code should appear
    8·1 answer
  • Evan is landscaping his backyard. The yard is shaped like a rectangle and measures 80 feet by 70 feet. He wants to spread topsoi
    9·1 answer
  • 5 2/8-3 7/8=? I need help plzz
    5·2 answers
  • Richard has $1,089.26 in his checking account at the end of the month. During the month, he withdrew $120, deposited a check for
    6·1 answer
  • I don't get this I NEED HALP PLZZZ!!!!!
    15·2 answers
  • The speed of light is 3 x 105 kilometers per second. What is that in standard form?
    14·2 answers
  • Two-ninths of the total number of batteries in Richard's desk drawer is made
    14·2 answers
  • Y=3x, is this in standard form? And if not can i get an explanation on why not?
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!