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3 years ago

Help me please I need help!

Mathematics

2 answers:

nordsb [41]3 years ago

8 0

Answer:

I'd say A because this question is just like y and xays.

Step-by-step explanation:

Alexandra [31]3 years ago

4 0

The answer to this question is a

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Given the equation 5x − 4 = –2(3x + 2), solve for the variable. Explain each step and justify your process.

blagie [28]

A.
$5x-4=-2(3x+2) \ \ \ \ \ \ \ \ \ |\hbox{expand the bracket} \\
5x-4=-2 \times 3x-2 \times 2 \\
5x-4=-6x-4 \ \ \ \ \ \ \ \ \ \ \ \ \ |\hbox{add 6x to both sides} \\
11x-4=-4 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\hbox{add 4 to both sides} \\
11x=0 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\hbox{divide both sides by 11} \\
x=0$

B.
$3(2x-4)=5x-1 \\
6x-12=5x-1 \\
\boxed{11x-12=-1} \Leftarrow \hbox{the first mistake} \\
11x=11 \\
\boxed{x=11} \Leftarrow \hbox{the second mistake}$

Megan's solution isn't correct.
The first mistake: she subtracted 5x from the right-hand side of the equation, but added 5x to the left-hand side.
The second mistake: she divided the right-hand side of the equation by 11, but didn't divide the left-hand side.

The correct solution:
$3(2x-4)=5x-1 \ \ \ \ \ \ \ \ \ \ \ |\hbox{expand the bracket} \\
3 \times 2x+3 \times (-4)=5x-1 \\ 6x-12=5x-1 \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\hbox{subtract 5x from both sides} \\
x-12=-1 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\hbox{add 12 to both sides} \\
x=11$

3 0

2 years ago

Anna bought p packages of paper plates at Party City that cost $4 per package and c packages of cups that cost $3 per package. S

sergeinik [125]

Answer:

$46

Step-by-step explanation:

Cost: 4p + 3c + 16

if p=3 and c=6 then,

4(3) + 3(6) +16

12+18+16

46 dollars spent

4 0

2 years ago

Evaluate if w = –2.1 and z = 5.7.<br> w – z – 4

Alex777 [14]

The answer will be -13.8

5 0

2 years ago

Read 2 more answers

Help me please fvfbvtne d f vrgvbv

Ivenika [448]

Answer:

<h2>Height (h) =54.6mm</h2>

Step-by-step explanation:

Given :

Base (b) = 7.7mm

Area (a) = 210.21mm^2

Height (h) = ?

$Area = \frac{base\times height}{2} \\\\210.21= \frac{7.7\times h}{2} \\\\210.21\times2 = 7.7\times h\\\\420.42 = 7.7 h\\\\\frac{420.42}{7.7}=\frac{7.7h}{7.7}\\\\54.6 =h\\\\h=54.6$

8 0

2 years ago

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Having opposite sides parallel is a __________ condition for having a parallelogram.

Elodia [21]

"necessary"

It is not a "sufficient" condition. Another condition is that the figure be a plane quadrilateral.

4 0

3 years ago