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Korolek [52]
3 years ago
12

3x + 11 = 7x + 3. what is the value of x?

Mathematics
2 answers:
Xelga [282]3 years ago
8 0
3x + 11 = 7x + 3\\
4x=8\\
x=2
Pavel [41]3 years ago
4 0
3x+11=7x+3\ \ \ \ |Subtract\ 3x\\\\
11=4x+3\ \ \ |Subtract\ 3\\\\
8=4x\ \ \ |Divide\ by\ 4\\\\
x=2
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For your friend's birthday, you have 3 presents to wrap. Find the combined surface area of these 3 gifts so you know how much wr
omeli [17]

The answer is: 5,614 square inches.

The explanation is shown below:

1. The gift on the bottom is a rectangular prism. To calculate its surface area, you must apply the following formula:

 SA=2[(l)(w)+(l)(h)+(h)(w)]

Where l is the length (20 inches), w is the width (42 inches) and h is the heigth (16 inches).

2. Substitute values:

SA1=2[(20in)(42in)+(20in)(16in)+(16in)(42in)]=3,664in^{2

3. The surface area of the other gifts can be calculated with the formula for calculate the surface area of a cube:

SA=6s^{2}

Where s is the side.

4. The surface area of the bigger cube is:

SA2=6(15in^{2})=1,350in^{2}

5. The surface area of the smaller cube is:

SA3=6(10in^{2})=600in^{2}

6. The total surface area (the combined surface area of the three gifts) is:

SAt=SA1+SA2+SA3\\SAt=3,664in^{2}+1,350in^{2}+600in^{2}\\SAt=5,614in^{2}

7 0
3 years ago
A music store sells used cds for $5 each and buys used CDs for$1.50 each. you go to the store with $20 and some CDs to sell. you
olya-2409 [2.1K]
Let x be the number of CDs we buy and y the number of CDs we sell. 
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Add the above values like this:
1.5y-5x
We have $20, add them like this:
1.5y-5x+20
Since we want to have<span> at least $10 left when you leave the store, then 
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5 0
3 years ago
On a map the Browns are using 2
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Answer: 337.5 km

Step-by-step explanation:

Use proportion:

2:75=9:x

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6 0
3 years ago
Grade 10 math help please. Please show work
masha68 [24]

Answer:

43.94?

Step-by-step explanation:

I think if you use inverse cos you should get the correct number. So, to find cos, you need to know the adjacent side and the hypotenuse. Here, the reference angle would be the person holding the kite. The distance from the person to the barn is the adjacent side, which is 18. The string of the kite, I assume, would be 25.

cos(∅) = \frac{18}{25}

cos(∅) = 0.72

cos⁻¹(0.72) = 43.94

I don't know if that's what you're looking for, but... If it's not correct, lmk so I can rewrite it. :)

4 0
3 years ago
Deshaun and his wife are each starting a saving plan. Deshaun will initially set aside $750 and then add $135 every month to the
Bumek [7]
If A=750+135N; and B=485N, then A+B=
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3 0
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