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
Ilya [14]
3 years ago
15

The sum of a number and 8 is 15

Mathematics
2 answers:
kodGreya [7K]3 years ago
3 0
You mean, what is this number?

we can rephrase it like this: the sum of a number x and 8 is 15

which is:

x+8=15

we subtract 8 from both sides and we get
x=7

so the answer is 7.
densk [106]3 years ago
3 0
Let the missing number be known as 's'

s + 8 = 15

Subtract 8 from both sides of the equation.

s + 8 = 15
     -8    -8
---------------------
s = 7.

You might be interested in
Can anyone help me with these?
Lapatulllka [165]

Answer:

im sorry i have no idea

Step-by-step explanation:

6 0
3 years ago
The ratio of Dobermans to terriers is 2:7. There are 774 dogs altogether.
Nataly_w [17]

Answer:

172-602

Step-by-step explanation:

3 0
2 years ago
"if A then B" can be described as
ella [17]
...a conditional statement in logic or computer science. Sometimes it’s called a Boolean.
8 0
3 years ago
A chemist mixes 50 milliliters of a solution that is 20% acid with 75 milliliters of a solution that is 45% acid. How many milli
natka813 [3]
Answer:
81.25 mL
Why?
Total amount of millilitres: 125 mL
Let x represent the millilitres of acid.
Let a represent the amount of acid in the 50 mL solution.
Let b represent the amount of acid in the 75 mL solution.
This means that x = 125 - (a + b)
So, a = 0.2*50
a = 10
So, b = 0.45*75
b = 33.75
Plug it into our equation;
x = 125 - (a + b)
x = 125 - (10 + 33.75)
x = 125 - 43.75
x = 81.25
Therefore, 81.25 mL of the 125 mL mixture is acid.
Alternate solution:
Let x represent the millilitres of acid.
Let a represent the number of millilitres in the mixture.
Let b represent the percentage of acid in the mixture.
This means that x = b*a
So, a = 50 + 75
a = 125
So, b = 0.2 + 0.45
b = 0.65
Plug it into our equation;
x = b*a
x = 0.65*125
x = 81.25
Therefore, 81.25 mL of the 125 mL mixture is acid.

(Hope this helps)
4 0
2 years ago
PLZ HELP ME <br> In which table does y vary directly with x?
Sergio [31]

Answer:

column D

Step-by-step explanation:

may the answers right

3 0
3 years ago
Other questions:
  • Rita is adding 3 + (–8) + 1. She rewrites the expression as 3 + (–1) + 8. <br> What is Rita’s error?
    7·2 answers
  • 30 points. Please help.
    5·1 answer
  • 10% of the students in a school like the color purple. 162 students don't like the color purple. How many students are in the sc
    5·1 answer
  • I need help with this quick question!! Extra points and I’m marking brainlist to step by step explanation
    13·2 answers
  • which of the following is the probability that a blue marble will be selected from a bag containing 9 red marbles,6 blue marbles
    12·2 answers
  • Mr.Tan and his friends planned a group visit for three adults and nine children.Find the amount of money they had to pay for the
    11·1 answer
  • If mAngle3 = 29°, what is mAngle4?
    7·1 answer
  • Y=-4.3x-1.3<br> Y=1.7x+4.7
    15·1 answer
  • Given the function f(x) = √x-8 + 3 which of the following is the value of f(24)
    12·1 answer
  • Does this set of ordered pairs represent a function? (-1,5)(0,-3)(2,7)(4,0)(7,5)
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!