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3 years ago

14

2/3*(-4/5)

2 answers:

Minchanka [31]3 years ago

6 0

See the attached figure for solutions

Volgvan3 years ago

4 0

<h2>Hello!</h2>

The answer are:

$\frac{-8}{15}$
$-1$
$-2$
$\frac{-3}{10}$

<h2>Why?</h2>

Fraction multiplications are lineal, it means that when we want to multiply a fraction by other fraction, we should multiply numerators by numerators and denominators by denominators.

Calculations:

$\frac{2}{3}*\frac{-4}{5}=\frac{-8}{15}\\\\\frac{-5}{7}*\frac{7}{5}=\frac{-35}{35}=-1\\\\ \frac{-2}{39}*39=\frac{-78}{39}=-2\\\\\frac{2}{5}*\frac{-3}{4}=\frac{-6}{20}=\frac{-3}{10}$

Have a nice day!

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Triangle XYZ, XY= 80, ZY= 64 XZ= 48 what is the cosine

SVETLANKA909090 [29]

Answer:

$cos=\frac{4}{5}$

Step-by-step explanation:

Cosine is the adjacent side over the hypotenuse (You can remember sin, cos, and tan by using sohcahtoa or sin = opposite/hypotenuse, cos = adjacent/hypotenuse, tan = opposite over adjacent). I think a picture would help, too.

I attached a picture of what I think the triangle would look like.

If the picture is right (we're assuming it is) and going with what we're given (the triangle was addressed as triangle XYZ, meaning that <u>angle Y is in the middle and that's the one we'll use</u>).

Looking at my picture then:

$cos=\frac{64}{80} \\cos=\frac{8}{10} \\cos=\frac{4}{5}$ .

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3 years ago

Describe the relationship between the area of a circle and its circumstances

valentina_108 [34]

Answer:

$A = \frac{r}{2}C$

Step-by-step explanation:

Given

Shape: Circle

Required

The area and the circumference (relationship)

This implies that, we write an expression that relates the area and the circumference.

Circumference is calculated as:

$C = 2\pi r$

Area is calculated as:

$A = \pi r^2$

The area can be rewritten as:

$A = \frac{2\pi r^2}{2}$

Further rewrite as:

$A = \frac{r}{2}*2\pi r$

Recall that: $C = 2\pi r$

So, the expression becomes

$A = \frac{r}{2}*C$

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Answer:

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Step-by-step explanation:

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3 years ago

X/-4 + 14>20<br><br> someone help a girl out

MrRa [10]

Answer:

x < -20

Step-by-step explanation:

x / -4 + 14 >20

Subtract 14 from each side

x / -4 +14-14 > 20 -14

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7 0

3 years ago

Read 2 more answers

Initially, there were only 86 weeds in the garden. The weeds grew at a rate of 29% each week. The following function represents

Dmitry [639]

Answer:

Option A. $f(x)=86[1.04]^{x}$ ; grows approximately at a rate of 0.4% daily

Step-by-step explanation:

we have

$f(x)=86(1.29)^{x}$

where

f(x) the number of weeds in the garden

x ----> the number of weeks

Calculate how quickly the weeds grow each day

Remember that a week is equal to seven days

so

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Using the law of exponents

b^(x/a) = b^(x*(1/a)) = (b^(1/a))^x

so

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therefore

The rate is approximately

1.04=1+r

r=1.04-1=0.04=4% daily

8 0

3 years ago