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3 years ago

I really need help with this, and I don't understand how to do this; not even with looking it up will help me.

Mathematics

2 answers:

Vinvika [58]3 years ago

7 0

Answer:

10.2 years

Step-by-step explanation:

it decays 4.9% per year.

figure out how many years it takes to decay 50% (half-life)

50/4.9 = 10.2

Eddi Din [679]3 years ago

3 0

It is 10.2 because....
..............

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Solve for x (please show work if possible)

mariarad [96]

X = 5

Solving steps:

1. 2x - 45 = - 35

2. 2x = - 35 + 45

3. 2x = 10

4. x = 5

Hope that helps

5 0

3 years ago

The set S = {x|-11 < x < 2} is described by which interval notation?

Alla [95]

They are open ended because -11 and 2 are not included in the interval.

<h3>Linear inequality in interval notation</h3>

Linear equations are expression not separated by an equal sign.

Given the inequality S = {x|-11 < x < 2}

This means that the values in the interval is between -11 and 2, the expression in interval notation will be given as;

(-11, 2). Note that they are open ended because -11 and 2 are not included in the interval.

Learn more on interval notation here: brainly.com/question/13160076

#SPJ1

3 0

2 years ago

A store is having a sale where everything is discounted 30% find the discount and sales price if a customer buys an item that no

frez [133]

Answer:

£465.50

Step-by-step explanation:

$\frac{30}{100} of 665\\$

Divide the bottom: 665 / 100 = 66.5

66.5 x 30 = 1995

Divide by a hundred

199.5

665 - 199.5 = £465.50

7 0

3 years ago

Triangle DEF (not shown) is similar to ABC shown, with angle B congruent to angle E and angle C congruent to angle F. The length

Bezzdna [24]

Answer:

Area of ΔDEF is $45\ cm^2$ .

Step-by-step explanation:

Given;

ΔABC and ΔDEF is similar and ∠B ≅ ∠E.

Length of AB = $2\ cm$ and

Length of DE = $6\ cm$

Area of ΔABC = $5\ cm^2$

Solution,

Since, ΔABC and ΔDEF is similar and ∠B ≅ ∠E.

Therefore,

$\frac{Area\ of\ triangle\ 1}{Area\ of\ triangle\ 2} =\frac{AB^2}{DE^2}$

Where triangle 1 and triangle 2 is ΔABC and ΔDEF respectively.

If two triangles are similar, then the ratio of the area of both triangles is proportional to the square of the ratio of their corresponding sides.

$\frac{5}{Area\ of\ triangle\ 2} =\frac{2^2}{6^2}\\ \frac{5}{Area\ of\ triangle\ 2}=\frac{4}{36}\\ Area\ of\ triangle\ 2=\frac{5\times36}{4} =5\times9=45\ cm^2$

Thus the area of ΔDEF is $45\ cm^2$ .

4 0

3 years ago

Read 2 more answers

What is unit form and standard form

r-ruslan [8.4K]

Like 2 hundred 3 tens

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3 years ago

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