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Ratling [72]
3 years ago
5

Solve by using trial and error method : 2x + 3 = 13​

Mathematics
2 answers:
Lynna [10]3 years ago
8 0
Answer is 5

2•5=10

10+3=13
Roman55 [17]3 years ago
5 0
Answer: x = 5

Explanation:
2•5 = 10
10 + 3 = 13

Hopefully this helps you.

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An instructor wants to write a test with 25 questions where each question is worth 3, 4, or 5 points based on difficulty. He wan
irakobra [83]

ANSWER

Find out the how many 3, 4, and 5 point questions could there be.

To proof

Let us assume that the 3 points based question be = x

Let us assume that the 4 points based question be = y

Let us assume that the 5 points based question be = z

As given

An instructor wants to write a test with 25 questions

than the equation become in the form

x + y + z = 25

he quiz to be worth a total of 100 points.

than the equation is becomes

3x + 4y + 5z =100

As given

He wants the number of 3-point questions to be 4 less than the number of 4-point questions

x = y -4

Than the three equation are

x + y + z = 25 ,3x + 4y + 5z =100 and x = y -4

put  x = y -4 in the x + y + z = 25 ,3x + 4y + 5z =100

than

2y + z = 29, 7y +5z= 112

multiply 2y + z = 29 by 5 and subtracted 7y +5z= 112

10 y -7y + 5y -5y = 145 -112

3y = 33

y = \frac{33}{3}

y =11

put in the  x = y -4

x = 11-4

x= 7

put the value of x ,y in the x + y + z = 25

7 + 11 +z =25

18 +z = 25

z = 25 -18

z=7

therefore

numbers of the 3 point question be = 7

numbers of the 4 point question be = 11

numbers of the 5 point question be = 7

Hence proved



3 0
3 years ago
Which algebraic expression is equivalent to the expression below? 6(4x + 5) + 11
Alina [70]

Answer:

24x + 41

Step-by-step explanation:

Distribute the 6.

6(4x + 5) + 11 = 24x + 30 + 11

Now we just add the 30 and the 11 which are at the back of the expression.

24x + 30 + 11 = 24x + 41

Therefore the answer is 24x + 41. Please mark brainliest if possible and i hope you get a good grade on your homework

3 0
2 years ago
Lindsey bought supplies for a class project and brought the receipt to school. The 6 items cost:
DochEvi [55]

Answer:

$5

Step-by-step explanation:

$5 appeared more in the prices

5 0
2 years ago
Read 2 more answers
What slope is parallel to:<br> m = 4
andreyandreev [35.5K]

Answer:

m = 4

Step-by-step explanation:

Parallel means to have the same slope but different x- and y- intercepts

An example would be y = 4x + 6 and y = 4x - 2

8 0
3 years ago
H represents the height of<br> H = 210 +33t<br> How fast does the tree grow
lisabon 2012 [21]

Answer:

243

Step-by-step explanation:

you just add

3 0
3 years ago
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