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Aleksandr-060686 [28]
3 years ago
13

Solve for X. Help please!

Mathematics
1 answer:
nataly862011 [7]3 years ago
4 0

Answer:

C

Step-by-step explanation:

180-80=100

100+5x+10+6x+4=180

114+11x=180

11x=66

x=6

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4 0
3 years ago
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Lily has $2. 75 in her pocket, consisting of dimes and quarters. If there are 17 coins in all, how many of each does she have?.
Nikitich [7]

Answer:

Lily has 7 Quarters and 10 Dimes

Step-by-step explanation:

Let's use pennies instead of $.

Let <u>D</u> and <u>Q</u> stand for the numbers of Dimes and Quarters, respectively.

We are told that there are 17 coins total:

  <u> D + Q = 17</u>

We also learn that they amount to 275 (pennies).  We can write that as:

<u>10D + 25Q = 275</u>  [Each D is worth 10 pennies, etc.]

We have two equations and two unknowns.  We can rearrange one equation to find the value of either of the unknowns, and then use that it the second equation.

I'll rearrange the first:  

 D + Q = 17

<u>   D = 17 - Q</u>

Now use this value of D in the second equation:

10D + 25Q = 275

10(17-Q) + 25Q = 275

170 - 10Q + 25 Q = 275

15Q = 105

<u>Q = 7  :  7 Quarters.</u>

<u></u>

Since D + Q = 17:

D + 7 = 17

<u>D = 10 Dimes</u>

==========================================

Let's check these results:

Q = 7 Quarters

D = 10 Dimes

1.  Is this 17 coins in total?  (7+10 = 17)  <u>YES</u>

2.  Does this add to $2.75?  (10*10) + (7*25) = 275 cents?

 (100 + 176) = 275 (cents)   <u>YES</u>

============================

Lily has 7 Quarters and 10 Dimes

8 0
3 years ago
In kick boxing, the force needed to break a board varies inversely with the length of the board.If it takes 5 pounds of pressure
Amiraneli [1.4K]

Answer:

Step-by-step explanation:

By taking k as constant:

P = k/L (where P is pressure, and L is length)

5 = k/2

k = 10

Therefore:

P = 10 / L

P = 10/ 8

P = 1.25 Pounds.

6 0
3 years ago
The group is planning to build a fence around the garden. How many yards of fencing materials do they need for the fence? Show y
garri49 [273]

Answer:

They need 130 yds to build up the fence.

Step-by-step explanation:

Attached you can find a picture that will guide the explanation. We will assume that each line is supposed to be a fence. We will assume also that the diagonals that cross any subfield that has the same vegetable is unnecessary.  That is that the diagonal of the tomatoes and the watermelon are not going to be built.

Recall that the red peppers area is a right triangle. So, using pythagora's theorem, we have that

b^2 +12^2 = 15^2 so b=15^2-12^2

which gives us that b = 9.

On the same fashion, the diagonal of the spinach-celery sector is \sqrt[]{8^2+6^2}=10. Recall that the field is a rectangle, so the perimeter of the outter fence is 2*(12+6)+2*(8+9) = 70 yds. Then, the total perimeter is given by

outter fence (70)+

fence spinach-watermelon (8) +

fence red peppers-watermelon(12)+

fence red peppers-carrots (15)+

fence carrots-tomatoes (9)+

fence celery-tomatoes(6) +

fence spinach-celery(10)

= 130 yds

(if the diagonals of tomatoes and watermelon are added, the same procedure applies. watermelon diagonal is 14.42 yds and tomatoes diagonal is 10.81 yds)

6 0
4 years ago
Which subset of real numbers does the square root of 3 belong to​
Tatiana [17]

Answer:

It is a Irrational Number.

Step-by-step explanation:

4 0
3 years ago
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