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Oxana [17]
2 years ago
12

Redute question and type your response in the box provided. Your response will be saved automatically

Mathematics
1 answer:
Verizon [17]2 years ago
3 0

Answer:

see explanation

Step-by-step explanation:

32 - 7x = 2x - 3(4x - 5) ← distribute parenthesis

32 - 7x = 2x - 12x + 15

32 - 7x = - 10x + 15  ( add 7x to both sides )

Anna made her error here in that she subtracted 7x from both sides

32 = - 3x + 15 ( subtract 15 from both sides )

17 = - 3x ( divide both sides by - 3 )

- \frac{17}{3} = x ← is the solution

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If x=7+root 40 ,find the value of root x+1by the root of x​
Luda [366]

Chapter : Algebra

Study : Math in Junior high school

x = 7 + √40

find √x of √x + 1

= √x + 1

= √(7+√40) + 1

in Formula is :

= √7+√40 = √x + √y

= (√7+√40)² = (√x + √y)²

= 7+√40 = x + 2√xy + y

= 7 + √40 = x + y + 2√xy

→ 7 = x + y → y = 7 - x ... Equation 1

→ √40 = 2√xy → √40 = 2.2√10 = 4√10

= xy = 10 ... Equation 2

substitution Equation 1 to 2 :

= xy = 10

= x(7-x) = 10

= 7x - x² = 10

= x² - 7x + 10 = 0

= (x - 5)(x - 2) = 0

= x = 5 or x = 2

Subsitution x = 5 and x = 2, to equation 1

#For x = 5

= y = 7 - x

= y = 7 - (5)

= y = 2

#For x = 2

= y = 7 - x

= y = 7 - (2)

= y = 5

and his x and y was find :

#Equation 1 :

= x = 5 and y = 2

#Equation 2 :

= x = 2 and y = 5

So that :

√7+√40 = √x + √y

= √7+√40 = √2 + √5

And that is answer of question :

= √2 + √5 + 1

3 0
3 years ago
8. Bob bought a pair of tennis shoes on sale
mr_godi [17]

Answer:

20%

Step-by-step explanation:

So, I would set this up as a proportion-

72          x

90        100

Cross multiply-

100 x 72 = 7200

Divide-

7200/90 = 80

Subtract-

100 - 80 = 20

So, it is a 20% decrease

4 0
3 years ago
What is the difference between a sequence and a series? What is the difference between a geometric and an arithmetic sequence?
Neporo4naja [7]

Answer/Step-by-step explanation:

A series is events coming one after another but a sequence is in a certain order.

arithmetic is the difference between two constant terms while geometric is the ratio between two constant terms.

arithmetic: -

geometric: ÷

5 0
3 years ago
Need help 21,22,23,24,25 pleasee help
zimovet [89]

Answer:

21. C

22. D I got 263.89

23. I'm not sure about this one

24. C

25. D

Step-by-step explanation:

I hope the ones i answered were correct if not i am sorry

3 0
3 years ago
List down 5 values of x that makes it TRUE to the equation x - 5 < 35
Molodets [167]

Answer:

5,4,3,2,1

Step-by-step explanation:

4 0
3 years ago
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