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3 years ago

Solve the equation 7x+11=4x-4

Mathematics

2 answers:

iris [78.8K]3 years ago

5 0

Answer:

x=-5

Step-by-step explanation:

7x+(-4x)=-11-4

3x=-15

x=-5

jeka943 years ago

4 0

3x=-15
x=-5
The answer is x = -5 because it’s -15 divided by 3

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mafiozo [28]

Answer:

Solution given:.

area of traingle EFG=1/2b×h=1/2×7×6=21cm²

area of rectangle ABCD=l×b=(20+9)×7=203cm²

area of rectangle BHIJ=l×b=9×11=99cm²

Total area =21+203+99=323cm² is a required answer

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4 years ago

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Scilla [17]

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3 years ago

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BabaBlast [244]

A) .10
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3 years ago

Please help me with this question!

gavmur [86]

First off, let's convert the percentages to decimal format, so our 77% turns to 77/100 or 0.77, and our 55% turns to 55/100 or 0.55 and so on

now, the sum of both salines, must add up to the 77% mixture, let's say is "y"
so, 11 + 4 = y, and whatever the concentration level is, must also sum up to the mixture's concentration of 77%

anyway thus

$\bf \begin{array}{lccclll}
&amount&concentration&
\begin{array}{llll}
concentrated\\
amount
\end{array}\\
&-----&-------&-------\\
\textit{first sol'n}&11&x&11x\\
\textit{second sol'n}&4&0.55&2.20\\
------&-----&-------&-------\\
mixture&y&0.77&0.77y
\end{array}\\\\
-------------------------------\\\\
\begin{cases}
11+4=y\implies 15=\boxed{y}\\
11x+2.2=0.77y\\
----------\\
11x+2.2=0.77\cdot \boxed{15}
\end{cases}$

solve for "x"

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4 years ago

In a village the number of houses and the number of flats are in the ratio 7 : 4 the number of flats and the number of bungalows

LenaWriter [7]

Answer:

140

Step-by-step explanation:

We can find the number of houses from ...

# houses = (houses/flats)(flats/bungalows)(# bungalows)

= (7/4)(8/5)(50)

# houses = 140

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3 years ago