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tankabanditka [31]
3 years ago
14

I need help with this problem please

Mathematics
1 answer:
Flura [38]3 years ago
6 0
Ans is B because if you remember about fractions the numerator cant' be bigger than denominator if denominator is bigger, 
and vice versa
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Plzzz help me with and i will give u a brainliest
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THE FIRST ANSWER is the answer
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Which of the following expressions is equivalent to −56−13?Select all that apply.
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So -56 -13 = -69
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2 years ago
Figure 3<br> 2n + 10<br> 140<br> 4n -40<br> 80<br> 2n<br> 3n - 20<br> I need help
abruzzese [7]

Answer:

2n +10= 140

4n- 40= 80

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Step-by-step explanation:

it is the am progression or sum progression

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2 years ago
Simply the expression-2.3(4r+5)-3.6r
laiz [17]

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3 0
3 years ago
Read 2 more answers
The table below models the cost, y, of using a high-efficiency washing machine and a standard washing machine over x number of y
SSSSS [86.1K]

ANSWER:

i) y = 25x + 500

ii) y = 30x + 400

iii) The washing machines would cost the same amount after 20 years of use

iv) Standard machine

Step-by-step explanation:

i)

We are to determine a straight line equation that models the cost of High-Efficiency washing machine over the years;

The first step step is to determine the slope of the line,

( change in y) / ( change in x ) = (550 - 525) / ( 2 - 1) = 25

The equation is slope-intercept form will be;

y = 25x + c

Where y is the cost of the High-Efficiency washing machine and x the number of years. To determine the y-intercept, c, we use any pair of points given in the data table;

when x = 1, y = 525

525 = 25(1) + c

c = 500

Therefore;

y = 25x + 500

ii)

The straight line equation that models the cost of Standard washing machine over the years;

Slope = (460 - 430) / (2 - 1) = 30

The equation is slope-intercept form will be;

y = 30x + c

when x = 1, y = 430

430 = 30(1) + c

c = 400

Therefore;

y = 30x + 400

Where y is the cost of the standard washing machine and x the number of years.

iii)

Given the cost functions for both machines over the number of years, we simply equate the two equations and determine the value of x when both machines would cost the same amount;

We have the cost functions;

y = 25x + 500

y = 30x + 400

Equating the two and solving for x;

25x + 500 = 30x + 400

500 - 400 = 30x - 25x

100 = 5x

x = 20

Therefore, the washing machines would cost the same amount after 20 years of use.

iv)

In order to determine which machine would be the more practical purchase if kept for 9 years we use the cost functions obtained in i) and ii)

The cost function of the High-Efficiency washing machine is;

y = 25x + 500

To determine the cost, we solve for y given x = 9

y = 25(9) + 500

y = 725

The cost function of the Standard washing machine is;

y = 30x + 400

We solve for y given x = 9

y = 30(9) + 400

y = 670

Comparing the two values obtained, the cost for the Standard washing machine is more practical.

3 0
2 years ago
Read 2 more answers
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