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
jenyasd209 [6]
3 years ago
5

Twice a number is decreased by 7, and this quantity is multiplied by 3. the result is 9 less than 10 times the number. What is t

he number?
Mathematics
1 answer:
Lunna [17]3 years ago
5 0

Answer:

(7-2x)3 =9-10x

x= -3

Step-by-step explanation:

we let the number to be x.

twice a number=2x is decreased by 7 that is to say 7-2x, is multiplied by 3, we have (7-2x)3.

the result is 9 less than 10times the number which is =9-10x.

so bringing all these together we have;

(7-2x)3=9-10x.

what is the number?

solving, we have:

(7-2x)3=9-10x

21-6x=9-10x

21-9= -10x+6x

12= -4x

dividing both sides by -4 we have our number

x= -3.

for proof we can substitute x=-3 into the equation.

21-6(-3) =9-10(-3)

21+18=9+30

39=39

You might be interested in
May someone please help me with this :)
Luda [366]
So to find the answer you would use the formally 1/2bh
1/2(3.5)(1.5)
which give you 2.625
8 0
3 years ago
If there are 6 hours in a school day, 5 school days in a week, 4 school weeks in a month and 9 months in a school year, how many
tino4ka555 [31]

Answer:

1080

Step-by-step explanation:

6 0
3 years ago
A store has a 40% off sale on headphones. With this discount, the price of one pair of headphones is $36.
Aloiza [94]

Answer:

21.6

Step-by-step explanation:

i did the math

7 0
2 years ago
Read 2 more answers
Find the value of x then classify the triangle by its angles
Neporo4naja [7]

Answer:

Step-by-step explanation:

3x + x + 60 = 180.

first, we add the x's together.

4x + 60 = 180

then we see if they all have a common multiple. in this case, they do. they are all divisible by 4, so we can use that.

x + 15 = 45

then, just subtract 15 from both sides, that way we get the variable by itself.

x = 30

also, it is a right triangle. the top angle (3x) multiplied by 3 is 90. any triangle that has a 90 degree angle is automatically a right triangle.

6 0
2 years ago
Read 2 more answers
Area of rectangle with diagonal of 5 in but length not given
sergij07 [2.7K]

Draw a rectangle with diagonal 5 in. Inside this rect. are 2 acute triangles of hypotenuse 5. Note that 3^2 + 4^2 = 5^2; thus the width of the rect. is 3 and the length is 4, with the result that the hypo. is sqrt(3^2+4^2), as expected.




3 0
3 years ago
Other questions:
  • How do you add and subtract indices?
    15·2 answers
  • a model railroad kit contains curved tracks and straight tracks . Given that 35 % of the tracks are curved , what fraction of th
    12·1 answer
  • Rachel is a lunchroom supervisor at West School. The children eat lunch at 15 long tables. When all tables are used, 240 childre
    9·2 answers
  • Jamie ran 1/5 of a relay. She ran 3/4 of a mile. How long was the relay?
    9·1 answer
  • What is the distance from the point at (2,-1) to the line y=4 A. 4 B. 5 C. 6 D.7
    13·1 answer
  • You can buy 9 cds and 5 dvds with the amount of money you have. If you buy only cds, how many can you buy?
    9·1 answer
  • F (x) = x — 1 — 3, and
    15·1 answer
  • Pls help questions on the picture i will give brainleist
    7·2 answers
  • In a game of luck, a turn consists of a player rolling 7 six-sided dice and counting how many of the dice
    8·1 answer
  • Plz help! Due tonight!
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!