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fredd [130]
3 years ago
9

Practice writing equations from sentences. Assignment Which sentences describe the relationship between an expression and an equ

ation? Select all that apply.
An equation contains variables; an expression never does.
An equation contains an equal sign; an expression does not.
Both expressions and equations contain numbers and/or variables.
An expression has addition and subtraction; an equation never does.
An expression involves multiplication, but equations only use addition.​
Mathematics
1 answer:
Lunna [17]3 years ago
3 0

Answer:

An equation contains an equal sign; an expression does not.

Both expressions and equations contain numbers and/or variables

Step-by-step explanation:

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David helped his father stock the pond with baby catfish and blue gill. They put in a total of 75 fish. If the number of blue gi
lana [24]
x-\ amount\ of\ catfish\\\\
y-\ amount\ of\ blue\ gill\\\\\ 
 \left \{ {{x+y=75} \atop {2y+3x=175}} \right. |using\ substitution\ method:\ x=75-y\\\\
2y+3(75-y)=175\\
2y+225-3y=175\\
-y=-50\ \ |*(-1)
y=50\\
x=75-50=25\\
there\ were\ 25\ catfish\ put\ in\ the\ pond
6 0
3 years ago
Read 2 more answers
2x^2+7x-15=0
Rudiy27
First step is to factorize the given expression as follows:
2x^2 + 7x - 15 = (2x-3)(x+5)
This means that the two roots of the equation are 3/2 (or 1.5) and -5

Now, we will get r and s:
we are given that the value of r is greater than the value of s, since 1.5 is greater than -5, therefore:
r = 1.5
s = -5
5 0
3 years ago
Solve the system of equations using the elimination method. <br><br> 4x+3y=16<br> x=-3y+13
Ipatiy [6.2K]
Step by Step Solution
More Icon
System of Linear Equations entered :

[1] -4x - 3y = -7
[2] 16x - 3y = 13
Graphic Representation of the Equations :

-3y - 4x = -7 -3y + 16x = 13



Solve by Substitution :

// Solve equation [2] for the variable x


[2] 16x = 3y + 13

[2] x = 3y/16 + 13/16
// Plug this in for variable x in equation [1]

[1] -4•(3y/16+13/16) - 3y = -7
[1] - 15y/4 = -15/4
[1] - 15y = -15
// Solve equation [1] for the variable y


[1] 15y = 15

[1] y = 1
// By now we know this much :

x = 3y/16+13/16
y = 1
// Use the y value to solve for x

x = (3/16)(1)+13/16 = 1
Solution :
{x,y} = {1,1}
7 0
2 years ago
Read 2 more answers
Evaluate -2x^2-4x+3 when x=-2
Misha Larkins [42]

Answer:

  3

Step-by-step explanation:

A polynomial is sometimes easier to evaluate if it is first written in Horner form:

  -2x^2 -4x +3 = (-2x -4)x +3

For x = -2, this is ...

  (-2(-2) -4)(-2) +3 = 0(-2) +3 = 3

The value is 3 when x = -2.

8 0
2 years ago
Dylan is 15, which is 3 years older than twice his sister Savannah’s age. How old is savannah
Brrunno [24]

Answer:

Savannah's age = 6 years

Step-by-step explanation:

Let

Savannah's age = x

Dylan's age = 15

Dylan is 15, which is 3 years older than twice his sister Savannah’s age

Dylan = 2x + 3

Find Savannah's age

2x + 3 = 15

Subtract 3 from both sides

2x + 3 - 3 = 15 - 3

2x = 12

Divide both sides by 2

2x / 2 = 12 / 2

x = 6

Therefore,

Savannah's age = x

= 6 years

Dylan's age = 2x +3

= 2*6 + 3

= 12 + 3

= 15 years

4 0
3 years ago
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