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4 years ago

What is 2 1/2 divided by 1/3

Mathematics

1 answer:

olga nikolaevna [1]4 years ago

5 0

Answer:

7 1/2

Step-by-step explanation:

2 1/2 ÷ 1/3

Change the mixed number to an improper fraction

2 1/2 = (2*2+1)/2 = 5/2

5/2 ÷ 1/3

Copy dot flip

5/2 *3/1 = 15/2

Changing back to a mixed number

2 goes into 15 7 times with 1 left over

7 1/2

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Solve for X: -5x - 7<28

lesya [120]

Answer:

x < 7

Step-by-step explanation:

Given

5x - 7 < 28 ( add 7 to both sides )

5x < 35 ( divide both sides by 5 )

x < 7

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3 years ago

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A 41 gram sample of a substance that's used to detect explosives has a k-value of 0.1392. Find the substance's half life, in day

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Answer:

The substance half-life is of 4.98 days.

Step-by-step explanation:

Equation for an amount of a decaying substance:

The equation for the amount of a substance that decay exponentially has the following format:

$A(t) = A(0)e^{-kt}$

In which k is the decay rate, as a decimal.

k-value of 0.1392.

This means that:

$A(t) = A(0)e^{-0.1392t}$

Find the substance's half life, in days.

This is t for which $A(t) = 0.5A(0)$ . So

$A(t) = A(0)e^{-0.1392t}$

$0.5A(0) = A(0)e^{-0.1392t}$

$e^{-0.1392t} = 0.5$

$\ln{e^{-0.1392t}} = \ln{0.5}$

$-0.1392t = \ln{0.5}$

$t = -\frac{\ln{0.5}}{0.1392}$

$t = 4.98$

The substance half-life is of 4.98 days.

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3 years ago

EASY QUESTION POINT!!!! Find the missing values, if not whole number then round two decimal places

Scorpion4ik [409]

Answer:

Step-by-step explanation:

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3 years ago

For each 11 mm of coloured fabric Nick uses to make his curtains, he also uses 2 cm of white fabric. Express the amount of white

defon

Answer:

The amount of white fabric to coloured fabric as a ratio is 20:11

Step-by-step explanation:

We are given that For each 11 mm of colored fabric Nick uses to make his curtains, he also uses 2 cm of white fabric.

Length of colored fabric = 11 mm

Length of White fabric = 2 cm

1 cm = 10 mm

2 cm = 20 mm

So, length of white fabric = 20 mm

So, Ratio of the amount of white fabric to coloured fabric = $\frac{20}{11}$

Hence the amount of white fabric to coloured fabric as a ratio is 20:11

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3 years ago

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lana66690 [7]

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4 years ago

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