How do i evaluate an expression with a given variable

Answers

Answer 1

Answer: To evaluate an expression with a given variable means to replace the number in the place of the variable, and then solve to find what the expression equals.
Example would be: x + 3 and x = 4
x + 3
4+3 = 7
7 is the value of the expression now.

Related Questions

How do I factor out the coefficient of the variable -3/5k-3/10?
Can someone smart please tell me the answers to al of A-D ASAP
Plz answer the question
Four hundred two million seventy-three thousand one hundred eighty in standard form
when the length of a rectangle is X inches and the width is y inches, the perimeter is 30 inches. if the length is tripled and the width is quadrupled the perimeter becomes 102 inches. find the length and width of the original rectangle

Your class is learning to tie knots. Each student needs a piece of rope that is 3/8 yard long. How many yards of rope are needed for the 16 students in your class?

Answers

Answer:

6 yards

Step-by-step explanation:

Given that one class is learning to tie knots

There are 16 students in the class.

Each student has to have a separate piece of rope to learn to tie knots.

Length of the piece of rope needed for each child = 3/8 yars

Hence total length required for all the 16 students would be

a direction variation question

So we multiply 16 by 3/8 to get

answer.

Answer = 16(3/8) = 6 yards

it would be 6 yard long because you have to multiply 16 and 3/8 together I hoped I helped you today

can you find the cube root of a negative number? if so, is it positive or negative? explain your reasoning

Answers

yes you can and it is negative because if you think about it, the answer to the 3rd power is your original question, so for example, -8 would equal to the answer times itself 3 times
now ask yourself, does 2 times itself 3 times = to -8
or -2 times itself 3 times = to -8

Last year, the school library had a total of x books. Over the summer, the library acquired another 42 books and now has a total of 2,402 books. Which equation could be used to find x, the number of books the library had last year?A.2,402 + x = 42
B.x + 42 = 2,402
C.42x = 2,402
D.x - 42 = 2,402

Answers

B.x + 42 = 2,402 letter b

2x + y = 7
-x + y = 1

Answers

2x + y = 7 ---> ( 1st equation )
-x + y = 1 ---> ( 2nd equation)

Let's solve this problem by substitution method
So let's set 2nd equation to y equals
-x + y = 1 ---> ( 2nd equation)
adding x on both sides
y = 1 + x ---> (3rd Equation )

Substituting the value of y in equation 1
2x + x + 1 = 7
subtracting 1 from both sides
2x + x = 6
adding like terms on the left side
3x = 6
dividing both sides by 3
x = 2

Substituting the value of x in 2nd equation
-x + y = 1
-2 + y = 1
adding 2 on both sides
y = 1 + 2
y = 3

So, our answer is x = 2
y = 3

To check the answer pick any equation and substitute the values of x and y check check if it is equal to Right hand side
2(2) + 3 = 7 ( substituting in 1st equation)
4 + 3 = 7
7 = 7

-2 + 3 = 1 ( substituting in 2nd equation)
1 = 1

Hence proved.

Hope this helps you. :D

2x+y=7
-x+y =1 --> y = 1+x

Substitution y -->
2x+1+x=7;
3x+1=7;
3x=6;
x=2
y=1+2=3

x=2, y=3

How do you convert this mixed fraction 8 21/40 into a decimal

Answers

$8(21)/(40)=8(21\cdot5)/(40\cdot5)=8(105)/(200)=8(105\cdot5)/(200\cdot5)=8(525)/(1000)=\boxed{8.525}$

What is the square root of 50

Answers

7.07106781187, or 7.07 (If you want to round to the nearest hundredth.)

$√(50)= √(25) √(2)=5 √(2)$ =7.07....

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