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Kipish [7]
3 years ago
11

a dollar bill has length of 150 mm and a width of 50 mm . complete the number sentences below to show two ways to find the perim

eter of the dollar bill in millimeters
Mathematics
1 answer:
marysya [2.9K]3 years ago
8 0
<u><em>Hey There!</em></u>
<u><em>Perimeter=L+W×2</em></u>
<u><em>Perimeter=150+50×2</em></u>
<u><em>Perimeter=200×2</em></u>
<u><em>Perimeter=400</em></u>
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4x2 + 8x - 7 - (3x2 - X+9)​
Andreas93 [3]

Answer:

<h2>{x}^{2}  + 9x - 16</h2>

Step-by-step explanation:

4 {x}^{2}  + 8x - 7 - (3 {x}^{2}  - x + 9)

When there is a (-) in front of an expression in parentheses, change the sign of each term in the expression:

4 {x}^{2}  + 8x - 7 - 3 {x}^{2}  + x - 9

Collect like terms

4 {x}^{2}  - 3 {x}^{2}  + 8x + x - 7 - 9

{x}^{2}  + 9x - 7 - 9

Calculate

{x}^{2}  + 9x - 16

Hope this helps...

Good luck on your assignment...

5 0
3 years ago
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Write a system of equations to describe the situation below, solve using any method, and fill in the blanks.
Kaylis [27]

Answer:

Adults $ 17

Students: $8

Step-by-step explanation:

Adults: x

Students: y

a) 25x + 31y = 673

b) 27x +31y = 707

Elimination:

a) -1(25x + 31y = 673) = -25 -31y = -673

a + b

= (-25 -31y = -673) + (27x + 31y = 707)

= 2x = 34

x = 34/2

x = 17

Substitution a or b:

a) 25(17) + 31y = 673

425 + 31y = 673

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y = 248/31

y = 8

3 0
2 years ago
Which expression gives the x-coordinate of the solution of the system?
aalyn [17]
To find the the expression that gives the value of x we are going to proceed as follows: 
5x+3y=-18 equation (1)
2x-4y=-28 equation (1)

Step 1. solve for y in equation (2)
2x-4y=-28
-4y=-28-2x
y= \frac{-28-2x}{-4}
y=7+ \frac{1}{2} x equation (3)

Step 3. Replace equation (3) in equation (1) and solve for x
5x+3y=-18
5x+3(7+ \frac{1}{2} x)=-18
5x+21+ \frac{3}{2} x=-18
\frac{13}{2} x=-39
x= \frac{-39(2)}{(13)}
x=-6

We can conclude that the expression that gives the value of x is: x=-6
7 0
3 years ago
The weight of an object on a particular scale is 155.2 lbs. The measured weight may vary from the actual weight by at most 0.4 l
alexira [117]
155.2 + 0.4 = 155.6
155.2 - 0.4 = 154.8

so it ranges from : 154.8 to 155.6
5 0
3 years ago
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Please help my assignment is missing and I really need to finish it.
photoshop1234 [79]

Answer: it is D

Step-by-step explanation:

4 0
3 years ago
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