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
KengaRu [80]
3 years ago
15

Twice the sum of three and a number is 30. Find the number

Mathematics
1 answer:
DedPeter [7]3 years ago
5 0

9514 1404 393

Answer:

  • 2(x +3) = 30
  • 12

Step-by-step explanation:

When x represents the number, "the sum of 3 and a number" is (x+3). Twice that sum is 2(x+3). "Is 30" means this expression is equal to 30:

  2(x +3) = 30 . . . . an equation for the given conditions

__

We can solve this equation by dividing by 2:

  x + 3 = 15

  x = 12 . . . . . . subtract 3

The number is 12.

You might be interested in
2x-1<br> Evaluate the algebraic expressions for the given values of the variable
igor_vitrenko [27]
<span>An algebraic expression is an expression constructed from a number of constants and variables utilizing algebraic operations. These algebraic operations are addition, subtraction, multiplication, division, and exponentiation. A constant is constant, so its value is unchanged. A variable changes based on the value provided. In the provided example, 2x-1, there are two constants, "2" and "1", and one variable "x." The algebraic operations utilized are multiplication and subtraction. In order to evaluate the value of the algebraic expression, the given value for the variable must be substituted for the variable x, and then the algebraic operations executed to obtain the answer. For instance, if you were told that the value of x in this case was 2, then you would substitute the value 2 for x and perform the described operations. Remember to follow the order of operations when evaluating an algebraic expression! 2x-1 for x=2 2(2) - 1 4 - 1 3 is the answer. Remember, even though the multiplication operation is not explicitly stated, it is implied that a constant attached to a variable (termed a coefficient) is multiplied with the value of the variable.</span>
5 0
3 years ago
Marcy had 567 earmuffs in stock. If she can put 18 earmuffs on each shelf, about how many shelves does she need for all the earm
spin [16.1K]

567 / 18 = 31.5

But because she can't make half a shelf, the answer would be 32 shelves

5 0
3 years ago
Help pls lol
Kobotan [32]

Answer:

Options :

A.

C.

D.

Step-by-step explanation:

1200m + 500 = 10700

5 0
3 years ago
Explain what are all of the properties of real numbers and use an example for each.
Arada [10]

Answer:

mark me as a brainlist answer

Step-by-step explanation:

Give examples to explain the properties of real numbers

Property (a, b and c are real numbers, variables or algebraic expressions)Examples8.Additive Inverse Property a + (-a) = 04 + (-4) = 09.Multiplicative Inverse Property10.Zero Property of Multiplication a • 0 = 04 • 0 = 011.Closure Property of Addition a + b is a real number10 + 5 = 15 (a real number)

6 0
3 years ago
Which expression converts 100inches per minute to feet per minute?
Rzqust [24]
The are 12 inches in a foot. So 100ipm ÷12= fpm :) hope this helps
7 0
3 years ago
Other questions:
  • If x equals -3. find the matching value for y. 2x-3y=6
    9·1 answer
  • 12 h x $5/h. find the product list the units explain all of your work.
    15·1 answer
  • 9(g+3) use the distributive property to multiply
    12·2 answers
  • 51/8 in a fraction ?
    13·2 answers
  • What is 15+9+20+22+9 then x 5?
    11·2 answers
  • Help pleaseeeee????????
    7·2 answers
  • Joan had a difference of opinion with her boss and hence quit her job. She is now on the lookout for another suitable job. What
    14·2 answers
  • Describe the pattern in each sequence and determine the next term of the sequence.
    12·1 answer
  • Sin10°-cos10° product and evaluate​
    10·2 answers
  • Please help Ill give brainy pleas help please -
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!