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DochEvi [55]
3 years ago
13

If DF = 9x-39, find EF.

Mathematics
1 answer:
otez555 [7]3 years ago
7 0

DF=DE+EF\\\\DF=9x-39\\DE=47\\EF=3x+10\\\\\text{substitute}\\\\9x-39=47+3x+10\\9x-39=3x+57\ \ \ |-3x\\6x-39=57\ \ \ \ |+39\\6x=96\ \ \ \ |:6\\x=16\\\\\text{put the value of x to the expression}\ 3x+10\\\\EF=3(16)+10=48+10=58

Answer: EF = 58

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Are the lines y=-5 and y=3 parallel
olganol [36]

Answer:

yes

Step-by-step explanation:

because both of them are horizontal straight lines

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2 years ago
Simplify 4( 3+ 7y) + 6(2 - y) if y =2
UkoKoshka [18]

Answer:

68

Step-by-step explanation:

The expression is given as:

4( 3+ 7y) + 6(2 - y)

It is known that y is equal to 2. Therefore, substitute 2 in for y.

4(3+7(2))+6(2-2)

Now, solve according to PEMDAS: Parentheses, Exponents, Multiplication, Division, Addition, Subtraction

Solve inside of the parentheses first.

4(3+7(2))+6(2-2)

4(3+14)+6(0)

4(17)+6(0)

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Add

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3 years ago
What does this mean? (Picture)
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3 years ago
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Step-by-step explanation:

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7 0
2 years ago
Read 2 more answers
Please help me. I suck at math
serg [7]

Answer:

Answer is ...Obtuse

Step-by-step explanation:

\frac{m

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5x + 4 = 3x + 42

5x -  3x = 42 - 4

2x = 38

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substituting \: x = 19  \: \:in \:  \:  \:  \:  \:  \:  \: \\ m

We get,

m<ABC =

(5 \times 19) + 4 = 99

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4 0
3 years ago
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