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3 years ago

Which is the best buy?12 tins of fish at K7.80 or 6 tins of fish at K4.20?

Mathematics

1 answer:

sweet-ann [11.9K]3 years ago

8 0

Divide price by quantity of each and compare:

7.80 / 12 = o.65 per tin

4.20 / 6 = 0.70 per tin

12 for 7.80 is less per tin, so is the Best Buy.

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What is h?<br> Problem 23h=12

Grace [21]

Answer:

h= $\frac{12}{23}$

h=0.52173913043

Step-by-step explanation:

23h=12

divide 12 by 23

h= $\frac{12}{23}$

h=0.52173913043

Hope this helps! :)

7 0

2 years ago

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8-(4x+7)=5(x+6) ( I think the 7 might be m idk)

Bezzdna [24]

Answer:

its 3 :)

Step-by-step explanation:

Simplifying

8 + -1(4x + 7) = 5(x + 6) + -2

Reorder the terms:

8 + -1(7 + 4x) = 5(x + 6) + -2

8 + (7 * -1 + 4x * -1) = 5(x + 6) + -2

8 + (-7 + -4x) = 5(x + 6) + -2

Combine like terms: 8 + -7 = 1

1 + -4x = 5(x + 6) + -2

Reorder the terms:

1 + -4x = 5(6 + x) + -2

1 + -4x = (6 * 5 + x * 5) + -2

1 + -4x = (30 + 5x) + -2

Reorder the terms:

1 + -4x = 30 + -2 + 5x

Combine like terms: 30 + -2 = 28

1 + -4x = 28 + 5x

Solving

1 + -4x = 28 + 5x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-5x' to each side of the equation.

1 + -4x + -5x = 28 + 5x + -5x

Combine like terms: -4x + -5x = -9x

1 + -9x = 28 + 5x + -5x

Combine like terms: 5x + -5x = 0

1 + -9x = 28 + 0

1 + -9x = 28

Add '-1' to each side of the equation.

1 + -1 + -9x = 28 + -1

Combine like terms: 1 + -1 = 0

0 + -9x = 28 + -1

-9x = 28 + -1

Combine like terms: 28 + -1 = 27

-9x = 27

Divide each side by '-9'.

x = -3

Simplifying

x = -3

8 0

3 years ago

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Ax+by=(a-b) , bx - ay =(a+b) simultaneous linear equations using cross multiplication

Molodets [167]

Answer:

$x=1\,,\,y=-1$

Step-by-step explanation:

Given: $ax+by=a-b\,,\,bx-ay=a+b$

To solve: the given linear equations

Solution:

Consider the equations:

$A_1x+B_1y+C_1=0\\A_2x+B_2y+C_2=0$

By method of cross multiplication:

$\frac{x}{B_1C_2-B_2C_1}=\frac{y}{C_1A_2-C_2A_1}=\frac{1}{A_1B_2-A_2B_1}$

For equations: $ax+by=a-b\,,\,bx-ay=a+b$

$ax+by-(a-b)=0\\bx-ay-(a+b)=0$

Take $A_1=a\,,\,B_1=b\,,\,C_1=-(a-b)\,,\,A_2=b\,,\,B_2=-a\,,\,C_2=-(a+b)$

So,

$\frac{x}{-b(a+b)-a(a-b)}=\frac{y}{-b(a-b)+a(a+b)}=\frac{1}{-a^2-b^2}\\\frac{x}{-ab-b^2-a^2+ab}=\frac{y}{-ab+b^2+a^2+ab}=\frac{1}{-(a^2+b^2)}\\\frac{x}{-(a^2+b^2)}=\frac{y}{a^2+b^2}=\frac{1}{-(a^2+b^2)}\\\frac{x}{-(a^2+b^2)}=\frac{1}{-(a^2+b^2)}\,,\,\frac{y}{a^2+b^2}=\frac{1}{-(a^2+b^2)}\\x=1\,,\,y=-1$

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3 years ago

Myra owns a car service that charges a $5 flat rate and an additional $0.50 per mile, which is represented by the equation y = 0

Mademuasel [1]

The total cost for a car with 30 miles is $20.00.

First, do 0.5 × 30 because you need to find out how much it will cost. This will give you 15. From there, add the flat rate. 15 + 5 = 20, so it will cost $20.00.

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3 years ago

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X+y=1 If x=0, then y=

Ber [7]

Answer:

Step-by-step explanation:

x+y=1 if x=0, then y=1

5 0

3 years ago

Which is the best buy?12 tins of fish at K7.80 or 6 tins of fish at K4.20?​

Which is the best buy?12 tins of fish at K7.80 or 6 tins of fish at K4.20?