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LekaFEV [45]
3 years ago
11

Why do we use variables, and what is the significance of using them in expressions and equations?

Mathematics
1 answer:
n200080 [17]3 years ago
7 0
A variable is the unknown amount ojj
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Help me plz i have 3 question 30 points
Vlad1618 [11]
Here're the answers!!! Good luck!!
1) a = -7 (The first picture -Left to right)
2) x = -39
3) a = -2.1 (The last picture left to right)


Hoping this helped you out!! If my answer best helped you, please mark Brainliest! ;)

3 0
3 years ago
Find the value of the expression 3x for the following values of x when x = 10
ElenaW [278]

Answer:

A) 30

Step-by-step explanation:

3*10=30

A 30

3 0
3 years ago
Matteo is following this recipe to make a cake.
Fofino [41]

Answer:

30 ounces of butter

25 ounces of sugar

35 ounces of flour

15 eggs

10 tbps of baking powder

Step-by-step explanation:

All you do is multiple each quantity by 5 I think

we are learning about this in school but check the web to see if it is correct

4 0
2 years ago
Any help with this question please?
taurus [48]

Answer:

B.a=b, c≠0

C.a=b, c=0

D.a-b=1, c≠1

Step-by-step explanation:

The equation given is c = ax - bx. We can factor the right-hand side to obtain an equivalent equation which is c = (a-b)x

Let’s explore each answer choice given. We are looking for cases where there is no one solution for the equation.

A

a-b = 1 so the right-hand side becomes 1x and we have x=c. Since c is 0 we have one solution that is x=0

B

a=b so a-b =0 and the equation becomes 0=c but the answer choice says c does not equal zero. So in this case there is no solution. This is a correct answer to the problem.

C

This is the same as choice B but since C =0 both sides of the equation equal zero. We get 0=0 but notice that this is true no matter what the value of x is so this equation is called identity and any value of x will do so there isn’t one solution but rather infinitely many. This is another right answer.

D

Here a-b=1 so we end up with x = c and since c doesn’t equal one any value of x except 1 is a solution so there isn’t one solution but infinitely many. This too is an answer to the question.

E

Since a doesn’t equal b and since c = 0 we have (a-b)x = 0 so. Either a-b is zero but since a and b are different this can’t be or x is zero. This there is one solution: x=0.

<em>From the above, the answer to the question is choices </em><em>B, C, and D</em>

8 0
3 years ago
students planted 4(2x+3y) amount of trees on saturday and then 3(5x+4) amount of trees on Sunday. What is the total amount of tr
Reika [66]
35x plus 12 

you cannot add them since they are not like terms 
3 0
3 years ago
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