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pishuonlain [190]
3 years ago
7

What is the value of the expression when a = –4 and b = 5?

Mathematics
1 answer:
Annette [7]3 years ago
3 0
(a+2b)^3 + 3a^2\\\\=(-4+2(5))^3 + 3(-4)^2\\\\=(-4+10)^3 +3(16)\\\\=6^3 + 3(16)\\\\=216 + 48\\\\=\boxed{\bf{264}}

Your answer is B) 264.
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Your science teacher has a 1:200 scale model of the space shuttle Atlantis. Which of the proportions can you use to find the act
Daniel [21]

Answer: B. (1/200 = x/19.5)

 

EXPLANATION

 

Space shuttle Atlantis model scale 1:200

Length of Atlantis on model = 19.5

The actual length of Atlantis = x

Find x

 

Scale = 1:200; in decimal = 1/200

When length on model = 1

Actual length = 200

 

When actual length = x

Length on model = 19.5

Scale = x:19.5 ; in decimal = x/19.5

 

Equating both scales,

1/200 = x/19.5 (Option B)

5 0
4 years ago
If 39 is 15% of a number, what is that number? How did you find your answer?
Nana76 [90]

Answer:

260

Step-by-step explanation:

There are a few ways to solve this, but an easy to understand one is that 39=15%, therefore 13=5%, as it is taking 1/3 of each number. Then to get to 100% we would need to multiply 13=5% by 20 to get 260=100%

6 0
3 years ago
Read 2 more answers
Write an equation in slope intercept form given two points: (3,1),(0,10)
qaws [65]

Answer:

y = - 3x + 10

Step-by-step explanation:

We have to write an equation of a straight line in slope-intercept form that passes through the points (3,1) and (0,10).

Now, the equation of the straight line (using two points form) will be  

\frac{y - 1}{ 1 - 10} = \frac{x - 3}{3 - 0}

⇒ y - 1 = - 3(x - 3)

⇒ y - 1 = 9 - 3x

⇒ y = - 3x + 10 (Answer)

{Since the slope-intercept form of a straight line equation is y = mx + c}

We know the equation of a straight line when any two points on the straight line (x_{1},y_{1}),  (x_{2},y_{2}) are known, will be  

\frac{y - y_{1} }{y_{1} - y_{2}} = \frac{x - x_{1} }{x_{1} - x_{2}}

6 0
3 years ago
Solve the equation by factoring 0=x2+8x+16
stepan [7]

Answer:

Alright all you nee to do is move all terms

which gives you a Answer of x = - 4 Hope this helps :)

Step-by-step explanation:

If u want i can explained with more detail

6 0
3 years ago
Read 2 more answers
Plzz help me and don't give me a negative answer for points
LenaWriter [7]
1. No idea
2. Angle A
3. Line RT
4. NO, 4/2 = 2, 5/3 = Not 2
5.Asking someone else?
6. 6 ft.
7. 10.56, precisely
8. 90 degrees
9. 51 degrees
10. 24 ft.
4 0
3 years ago
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