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4 years ago

I NEED HELP ASAP I DONT UNDERSTAND THIS!!

Mathematics

1 answer:

zheka24 [161]4 years ago

3 0

Let the cost of the hair dryer equal x.

The net cost plus a 40% markup equals 42, set up an equation and solve forex.

1.4x = 42

Divide both sides by 1.4

X = 42 / 1.4

X = 30

The net cost was £30

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PLEASE HELP The points (6, 8) and (x, 12) are two points on a graph of an inverse variation. Find the missing value. Show all wo

UNO [17]

Answer:

X=9

Step-by-step explanation:

6/8=3/4

x/12=3/4

x=9

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4 years ago

This equation shows how the total number of quizzes Angie has ever taken in high school depends on the number of weeks she has a

zepelin [54]

Answer:

9 weeks

Step-by-step explanation:

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12 = w + 3 Subtract 3 both sides

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3 years ago

What is the exact time t, in years, needed for the balance of an account that earns 5% annual 8. Interest compounded continuousl

Brums [2.3K]

Answer:

It takes 22.52 years for the balance to triple in value.

Step-by-step explanation:

Continuous compounding:

The amount of money earned using continuous compounding is given by the following equation:

$A(t) = A(0)(1+r)^t$

In which A(0) is the initial amount of money and r is the interest rate, as a decimal.

Interest rate of 5%.

This means that $r = 0.05$ , and thus:

$A(t) = A(0)(1+r)^t$

$A(t) = A(0)(1+0.05)^t$

$A(t) = A(0)(1.05)^t$

Time for the balance to triple?

This is t for which $A(t) = 3A(0)$ . So

$A(t) = A(0)(1.05)^t$

$3A(0) = A(0)(1.05)^t$

$(1.05)^t = 3$

$\log{(1.05)^t} = \log{3}$

$t\log{1.05} = \log{3}$

$t = \frac{\log{3}}{\log{1.05}}$

$t = 22.52$

It takes 22.52 years for the balance to triple in value.

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3 years ago

List the following parabolas from widest to narrowest (would like a fast answer)

Nostrana [21]

Answer:

Step-by-step explanation:

The greater the magnitude of the leading coefficient, the narrower the parabola.

Widest: f(x) = 0.5x²

Next: f(x) = -x²

Next: f(x) = 2x²

Narrowest: 3x²

5 0

3 years ago

Read 2 more answers

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VashaNatasha [74]

Answer:

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3 years ago