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swat32
3 years ago
7

Solve for x. −7.8 (x + 6.5)= −25.74

Mathematics
2 answers:
Alexxx [7]3 years ago
7 0
Simplify both sides of the equation. (Distribute)
<span><span><span><span>(−7.8)</span>(x)</span>+<span><span>(−7.8)</span>(6.5)</span></span>=−25.74 </span>  <span><span><span><span>−7.8x </span>+ </span>−50.7</span>= −25.74 ------------->  </span>−7.8x − 50.7= −25.74
<span>Add 50.7 to both sides.
</span><span><span><span>−7.8x </span>− 50.7 </span>+ 50.7 </span>=  <span>−25.74 + 50.7 ---------------------> </span><span>−7.8x </span>= <span>24.96
</span><span>Divide both sides by -7.8.
</span><span><span>−7.8x /</span>−7.8   </span>=   <span>24.96/<span>−<span>7.8

</span></span></span><span>
X= </span><span>−3.2   :D</span><span>



</span>
adelina 88 [10]3 years ago
3 0
Divide both sides by -7.8
x+6.5=3.3
minus 6.5 from both sides
x=-3.2
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Andreyy89

By factorizing, we have

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Determine of which lines, if any, are parallel or perpendicular. Explain.
nalin [4]

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lines b and c are perpendicular

Step-by-step explanation:

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line c slope- 3-1/1-4 is 2/-3 or - 2/3

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Simora [160]
Surface area is just the area of all these 4 triangles plus the rectangle.

First we can find the area of the rectangle.

\sf A=lw

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\sf A=(56)(27)

\sf A=1512cm^2

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\sf 82.8-28=54.8\? cm

Calculate the area:

\sf A=\dfrac{1}{2}bh

\sf A=\dfrac{1}{2}(27)(54.8)

\sf A=739.8\?cm^2

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\sf 739.8\times 2=1479.6\? cm^2

Now do the other two pair of triangles. The bases for them are 28 + 28 = 56 cm. The heights would be the net width minus the width of the rectangle:

\sf 81.2-27=54.2\?cm

Now find the area:

\sf A=\dfrac{1}{2}bh

\sf A=\dfrac{1}{2}(56)(54.2)

\sf A=1517.6\? cm^2

We have two of these triangles.

\sf 1517.6\times 2=3035.2\?cm^2

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