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dalvyx [7]
3 years ago
11

PLEASE HELP QUICK

Mathematics
1 answer:
mezya [45]3 years ago
8 0

Answer:

74

Step-by-step explanation:

Using linear equations, we are given two equations from the questions:

4x +7y=30 from day one and 3x +5y=22 from day two

Multiply the first equation by 3 and second by 4 giving us

12x +21y=90 and 12x +20y=88. Minus both equations.

12x - 12x +21y - 20y= 90 - 88, Gives you y=2,

You can now use the value of y to find x.

4x + 7y = 30

4x + 7(2)= 30

4x + 14= 30. Minus 14 on both sides giving you

4x=16. Divide both sides by 4.

x=4

Now use both values to find how much money is needed on the third day.

10x + 17y

=10(4) + 17(2)

=40 +34

=74

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Whiskers the cat weighs 2 and 2 over 3 kg.piglio weighs 4 kg. How many times as heavy as piglio is whiskers
ruslelena [56]

Answer:

Whiskers is two-third times as heavy as piglio is.

Step-by-step explanation:

Given:

Weight of whiskers is, W=2\frac{2}{3}\ kg

Weight of piglio is, P=4\ kg

In order to compare their weights, we have to divide both the weights and then express one weight in terms of the other.

Therefore, dividing whiskers weight by piglio's weight, we get:

\frac{W}{P}=2\frac{2}{3}\div 4\\\frac{W}{P}=\frac{8}{3}\div \frac{4}{1}(\textrm{4 can be rewritten as 4/1 in fraction form})

Now, when we divide two fractions, we replace the division sign by multiplication and reverse the second fraction. This gives,

\frac{W}{P}=\frac{8}{3}\times \frac{1}{4}\\\frac{W}{P}=\frac{8\times 1}{3\times 4}\\\frac{W}{P}=\frac{2}{3}

Now, expressing 'W' in terms of 'P', we multiply both sides by 'P. This gives,

W=\frac{2}{3}P

Therefore, the weight of whiskers is two-third times as heavy as piglio is.

4 0
3 years ago
Select all ratios equivalent to 10:5.<br> 110:55<br> 24:2<br> 14:6
dlinn [17]
115:55 bc if you divide them both you fat the same answer which is 2
4 0
3 years ago
Read 2 more answers
Maya bought a new iphone case for $40. Now, it is on sale for $25. Find the percent of change in the
bulgar [2K]

Answer:

Step 1: $15

Step 2: 38%

Step-by-step explanation:

Step 1:

40 - 25 =15.

Therefore, the price would decrease by $15.

Step 2:

40 multiplied by .38 equals 24.80. You would round that up to 25. If you plugged in 37%, it would equal 25.20, which is over the price. Therefore the price decreased by 38%.

4 0
3 years ago
For two variable equation y - 3x = 15 find the matching y value when x = 1/3
damaskus [11]
Express y in terms of x in the given equation.
 
                                           y = 3x + 15

Substitute the given value of x in the modified equation,
 
                                                y = 3(1/3) + 15
 
                                                 y = 1 + 15 = 16

Thus, the matching value of y given the value of x is 16. 





3 0
4 years ago
Roland has 3 paperback books and 4 hardcover books. Each hardcover book is worth $11 more than each paperback book. If the value
solong [7]

Answer:

$5

Step-by-step explanation:

Let cost of paperback book be "p"

and

Cost of hardcover book be "h"

Each hardcover is $11 more than each paperback, thus we can write:

h = p + 11

3 paperbacks at "p" each and 4 hardcovers at "h" each totals 79, thus we can write:

3p + 4h = 79

We can now put the 1st equation in 2nd equation and find "p" (cost of paperback book). Shown below:

3p + 4h = 79\\3p + 4(p+11) = 79\\3p + 4p + 44 = 79\\7p = 79 - 44\\7p = 35\\p = \frac{35}{7}\\p = 5

Hence, each paperback book costs $5

7 0
4 years ago
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