3 years ago

How to solve for x in the following equation x(a-b)=m(x-c)

1 answer:

5 0

Expand,

$xa-xb=mx-mc$

Transfer all "x" terms to one side,

$xa-xb-mx=-mc$

Factor x out of the LHS.

$x(a-b-m)=-mc$

Divide both sides by (a-b-m).

$x= -\frac{mc}{a-b-m}$

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2y = x + 3

aksik [14]

Answer:

Solution: { -29/3 , -10/3 }

Step-by-step explanation:

2y = x + 3 ---------> equ 1

5y = x - 7 equ 2

equ 1 - equ s ====> -3y = 10

y = -10/3

Put y = -10/3 in equ 1

2 * (-10/3) = x + 3

-20/3 = x + 3

(-20/3) - 3 = x

(-20/3) - (9/3) = x

(-20 - 9) / 3 =x

x = -29/3

Solution: { -29/3 , -10/3 }

3 0

3 years ago

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Determine the margin of error in estimating the population mean, μ . A sample of 74 college students yields a mean annual income

Julli [10]

Answer:

$253

Step-by-step explanation:

Margin of error is the critical value times the standard error.

MoE = z × σ/√n

At 99% confidence, z = 2.576.

MoE = 2.576 × 844/√74

MoE = 253

7 0

4 years ago

If 10 litres of petrol cost 17.10$, calculate the cost of 4 litres of petrol?

MA_775_DIABLO [31]

Answer:

It will cost $6.84 for 4 litres of petrol

Step-by-step explanation:

$17.10÷10=$1.71.

$1.71×4=$6.84

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3 years ago

Which of these numbers is composite? 3,5,19,71,85

user100 [1]

Answer:

Step-by-step explanation:

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4 years ago

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Mangoes are on sale 4 for $3. Mindy buys 14 mangoes.

shutvik [7]

Answer:

11.76

Step-by-step explanation:

$14 \div 4 = 3.5 \\ 3.5 \times 3 = 10.5 \\ 10.5 \times (1 + 12\%) = 10.5 \times 1.12 = 11.76$

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3 years ago