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3 years ago

In a sale, a clothes shop reduces its 15%.

Mathematics

1 answer:

polet [3.4K]3 years ago

8 0

The new cost would be 19.55.

Explanation: 1. 23 * 0.15 = 3.45
2. 23 - 3.45= 19.55

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Krista was assigned a homework problem that stated there were 45 stamps purchased for $18.75. Some stamps were 40 cents, and som

Korolek [52]

Answer: Krista put 0.40 in the first equation meant for the number of stamps

Step-by-step explanation: From the information available to Krista, she can determine the number of stamps that cost 40 cents and those that cost 55 cents. What she needs is a system of simultaneous equations both of which would use the total number of stamps and the total cost of stamps to determine the how many stamps cost 40 cents and how many costs 55 cents.

The system of equations should have been,

x + y = 45 ----------(1)

0.40x + 0.55y = 18.75 ----------(2)

From equation (1), let x be the subject of the equation and hence x = 45 - y

Substitute for the value of x into equation (2)

0.40(45 - y) + 0.55y = 18.75

18 - 0.40y + 0.55y = 18.75

Collect like terms and you now have

0.55y - 0.40y = 18.75 - 18

0.15y = 0.75

Divide both sides of the equation by 0.15

y = 5

When y has been calculated as 5, substitute for the value of y into equation (1)

x + y = 45

x + 5 = 45

x = 45 - 5

x = 40

The results show that the stamps that cost 0.40 cents (x) were 40 in number while those that cost 0.55 cents (y) were 5 in number.

This answer could not have been derived due to the mistake Krista committed when writing the equations.

4 0

3 years ago

Read 2 more answers

Fractions greater than 1/2 all of them

Lera25 [3.4K]

There are a lot of them
3/4 , 2/3 any fraction greater than .5 will fall in this category.

6 0

3 years ago

A wildfire is spreading at an alarming rate. The wildfire begins at a size of 8 square feet. It then doubles its width every x h

Mrac [35]

Answer:

$14000=8\times 2^{x+y}$

Step-by-step explanation:

The wildfire begins at a size of 8 square feet

It means that initial area =8

It then doubles its width every x hours,

and doubles its length every y hours

so, we can set up equation

$A(x,y)=8(2)^x\times (2)^y$

now, we can simplify it

$A(x,y)=8(2)^{x+y}$

we are given

After a period of time, the wildfire covers 14,000 square feet

so, we can set A(x,y)=14000

we get

$14000=8(2)^{x+y}$

$14000=8\times 2^{x+y}$

7 0

3 years ago

Write the equation of the line in slope-intercept form.

Ymorist [56]

Answer:

y = 1/40x + 20

Step-by-step explanation:

Slope-intercept equation format:

y = mx + b

m = slope/ gradient/ constant of variation/ rate of change

b = y-intercept

To find the slope, use the formula:

$\frac{y_2-y_1}{x_2-x_1}$

Find two random points:

1 - (0.5, 40) , 2 - (1, 60)

Plug in:

$\frac{60-40}{1-0.5}$

Solve:

$\frac{20}{0.5}$

Divide:

$\frac{1}{40}$

The y-intercept is when the x-coordinate is equal to 0.

The y-intercept is always the beginning.

So observing the graph, the first point is (0, 20)

The x-coordinate is 0.

Y intercept = 20.

Plug in both slope and y-intercept:

y = 1/40x + 20

8 0

1 year ago

I NEED HELP ITS FOR A GRADE THIS IS LAST QUESTION I GIVE U BRAINLIEST IF U GET IT RIGHT

yulyashka [42]

Answer:

1rst is 2

2nd is 28 4/5

3rd is 26 4/5

3 0

3 years ago