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beks73 [17]
3 years ago
12

What's the answer to: 39-7x=-4(7x+7)+4

Mathematics
1 answer:
SOVA2 [1]3 years ago
3 0
Simplify <span>-28x-28+4−28x−28+4</span> to <span>-28x-24<span>−28x−2<span>4
</span></span></span> Add <span>28x28x</span> to both sides<span>39−7x+28x=−24Simplify <span>39-7x+28x39−7x+28x</span> to <span>39+21x<span>39+21<span>x
</span></span></span><span>39+21x=−24Subtract 39<span> from both sides
</span><span>21x=−24−39Simplify <span>-24-39−24−39</span> to <span>−6<span>3
</span></span><span>21x=−63Divide both sides by <span>21
</span>x=−​\frac{63}{21}
Simplify tex] \frac{63}{21} [/tex] to 3
<span>x=−3
</span>
</span></span></span></span>
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Factor the following using the difference of squares method
Bond [772]

Answer:

a)

{x}^{2}  - 16 \\  =  {x}^{2}  -  {4}^{2}  \\  = (x + 4)(x - 4)

b)

{9y}^{2}  - 25 \\ =   {(3y)}^{2}  -  {5}^{2}  \\  = (3y + 5)(3y - 5)

here is the answer hope that will help you

6 0
2 years ago
Find the angle of the sector given the radius and the area of the sector.
gregori [183]

Answer:

270 degrees

Step-by-step explanation:

Area  \: of  \: the  \: sector  \\  \\  =  \frac{ \theta}{360 \degree} \times  \pi {r}^{2} \\  \\ 339.3 =  \frac{ \theta}{360 \degree} \times  3.14 {(12)}^{2}  \\  \\ 339.3 =  \frac{ \theta}{360 \degree} \times  3.14  \times 144 \\  \\  \theta =  \frac{339.3 \times 360 \degree}{3.14 \times 144} \\  \\  \theta =  \frac{122,148\degree}{452.16}  \\  \\  \theta= 270.143312 \degree \\  \\ \theta \approx \:  270\degree

5 0
2 years ago
Will give brainliest!! Using the measurements of the shapes.. determine the area and perimeter of the irregular polygon.
yan [13]

Answer:

p=28.2\:\text{units},\\A=40.2\:\text{square units}}

Step-by-step explanation:

The irregular shape's area consists of the sum of the areas of all the shapes that make it up.

Area of pink triangle: \frac{1}{2}\cdot 3 \cdot 3=4.5

Area of purple square: 3^2=9

Area of green quadrilateral: 3\cdot 2.9=8.7

Area of blue triangle: \sqrt{10.25(10.25-8.5)(10.25-6)(10.25-6)}=17.99989

Therefore, the area of the irregular polygon is 4.5+9+8.7+17.99989\approx \boxed{40.2\:\text{square units}}.

The perimeter of the irregular polygon consists of certain shred sides from the four polygons that make up:

p=3+3+3+4.2+3+6+6=\boxed{28.2\:\text{units}}

5 0
2 years ago
What is the probability of rolling an even number o
ankoles [38]

Answer:

30%

Step-by-step explanation:

if it is six sides and the number only goes from one to six then you have to count how many even numbers are in between 1 and 6. That would be 2, 4, and 6. that is 3 numbers. And 3 over 10 is 3/10 which changes from a fraction into a percent and the percent is 30%. I hope you understand this sorry if you can't. Love ya bye.

3 0
3 years ago
20 less than 5 times a number is 85. What is the number
AveGali [126]

Answer: I don’t understand the question??

Step-by-step explanation: Can you say the question again like the same way the homework does

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3 years ago
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