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3 years ago

3x = 5х + 4 Please help mee

Mathematics

1 answer:

vladimir1956 [14]3 years ago

7 0

Answer:

X=-2

Step-by-step explanation:

3x=5x+4

subtract 5x from both sides

-2x=4

divide both sides by -2

x=-2

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What is 2 + 1 - 3 = 5 3 6

Paladinen [302]

2 + 1 = 3
3 - 3 = 0
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3 years ago

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Debbie has equal numbers of dimes and quarters with a total value of $1.40. How many coins does she have altogether?

-BARSIC- [3]

$x=amount\ of\ each\ coin. \\ .25x+.1x=1.4 \\ .35x=1.4 \\ x= \frac{1.4}{.35} \\ x=4\ of\ each\ coin. \\ 4\ quarters\ and\ 4\ dimes. \\ \boxed{8\ coins\ in\ total}$

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3 years ago

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HELP!! I NEED THIS QUICKLY

Elza [17]

Answer:

A and D

Step-by-step explanation:

We are given that

(3/4,2/3),(1/4,1),(1,1/2) and (1/2,1)

$x_1=\frac{3}{4}$

$y_1=\frac{2}{3}$

$x_2=\frac{1}{4},y_2=1$

$x_3=1,y_3=\frac{1}{2}$

$x_4=\frac{1}{2},y_4=1$

k= $\frac{1}{2}$

Direct proportion:

$\frac{x}{y}=k$

Inverse proportion: $xy=k$

$\frac{x_1}{y_1}=\frac{3}{4}\times \frac{3}{2}=\frac{9}{8}\neq \frac{1}{2}$

Therefore, it is not in direct proportion.

$\frac{1}{4\times 2}=\frac{1}{8}\neq\frac{1}{2}$

$\frac{1}{\frac{1}{2}}=2\neq \frac{1}{2}$

$x_1y_1=\frac{3}{4}\times \frac{2}{3}=\frac{1}{2}$

$x_2y_2=\frac{1}{4}\times 2=\frac{1}{2}$

$x_3y_3=1\times \frac{1}{2}=\frac{1}{2}$

$x_4y_4=\frac{1}{2}\times 1=\frac{1}{2}$

Therefore, $xy=k=\frac{1}{2}$

Hence, the given points form an inverse variation .

$xy=\frac{1}{2}$

$y=\frac{1}{2x}$

Option A and D is true.

6 0

3 years ago

How to rewrite <img src="https://tex.z-dn.net/?f=5%20%20%7B%3F%7D%5E%7B%20-%202%7D%20" id="TexFormula1" title="5 {?}^{ - 2}

Mrac [35]

Answer:

$\frac{1}{25}$

Step-by-step explanation:

using the rule of exponents

• $a^{-m}$ = $\frac{1}{a^{m} }$ , then

$5^{-2}$ = $\frac{1}{5^{2} }$ = $\frac{1}{25}$

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3 years ago

What is the m∠ABC? 1)m∠ABC = 60° 2)m∠ABC = 67° 3)m∠ABC = 120° 4)m∠ABC = 127°

docker41 [41]

we are given

m∠BCD =67

and m∠BDC=60

we know that

m∠ABC is exterior angle

m∠BCD and m∠BDC are interior angles

exterior angle is sum of interior angles

so, we can write it as

m∠ABC=m∠BCD+m∠BDC

now, we can plug values

and we get

m∠ABC=60+67

m∠ABC=127

so, option-4.........Answer

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4 years ago

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