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nekit [7.7K]
3 years ago
14

What are the steps to prove z+z+z+z=4z

Mathematics
1 answer:
Rina8888 [55]3 years ago
4 0
To prove the sum is 4z you can say I put an imaginary 1 in front of z because we know a variable by itself always has a one.
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Today, everything at a store is on sale. The store offers a 20% discount.
kotykmax [81]

Answer:

a) $19.2

b) 0.8x

c) $17.5

Step-by-step explanation:

1. We want to find the discount price given the regular price

The discount is 20%

so the discount price will be;

24 - 20% of 24

24 - 4.8 = $19.2

b) We have this as;

x - (20% of x)

x - 0.2x = 0.8x

c) let the original price be x

x - 20% of x = 14

x - 0.2x = 14

0.8x = 14

x = 14/0.8

x = $17.5

6 0
3 years ago
The perimeter of a rectangle is 90 cm the length is 27 cm what is the width of the rectangle
ser-zykov [4K]

Answer:

width = 18 cm

Step-by-step explanation:

perimeter of rectangle = 2(length + width)

then:

90 = 2(27+w)

90/2 = 27+w

w = width

45 = 27+w

45 - 27 = w

18 = w

Check:

90 = 2(27+18)

90 =2*45                                       =

3 0
3 years ago
I need help with this ​
LuckyWell [14K]

Answer:

1st - Yes ; 2nd - Yes ; 3rd - Yes ; 4th - No

Step-by-step explanation:

8 0
3 years ago
If 5(x + 7)= -3, then 5x +35= -3
tensa zangetsu [6.8K]
= 5x + 35 = -3
- 35 = -35
5x = -38
/ 5 = / 5
x = -7.6
8 0
3 years ago
James estimated the total cost of groceries to be $50.
Lilit [14]
The answer is 30%.... because 50/65 is .3
5 0
3 years ago
Read 2 more answers
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