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Rus_ich [418]
2 years ago
9

Evaluate the expression when p=7. 3p²

Mathematics
2 answers:
Sliva [168]2 years ago
5 0

Answer:

147

Step-by-step explanation:

p = 7
3(7)^2 = 3(49)
3(49) = 147

Hope this helped

NikAS [45]2 years ago
3 0

Step-by-step explanation:

the other answer is correct.

I will just try to give you a little bit more explanation about the why.

when you have a function definition or simply an expression using variables, these variables are nothing else but placeholders for actual values.

such expressions are like a recipe : a structure of instructions what to do, when you get the real ingredients.

so, when or function is like here

f(p) = 3p²

it simply means that as soon as we get a real value for p, we have to square this value and then multiply that result by 3. and that is then the functional result.

and indeed, we have a specific value for p : p = 7.

so, now, we take this "7" and put it in every place, where there is a "p" in the "recipe" (because it could be a much more complex function with multiple terms based on "p").

just like we would use e.g. real butter and put it into our dough in the way the recipe describes how and when to apply butter in general.

hence,

3×7² = 3×49 = 147

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Answer:

9/11

Step-by-step explanation:

4 1/2= 9/2=11/2n

so n =9/11

so 9/2=11/2*9/11

8 0
3 years ago
Where will her cut be located? Round to the nearest tenth. x = (StartFraction m Over m + n EndFraction) (x 2 minus x 1) + x 1 A
Arte-miy333 [17]

Answer:

The correct answer is 25.2 in.

Step-by-step explanation:

It is given that number line goes from 0 to 60 which can be used to represent a ribbon of length = 60 inches.

2 inches of the ribbon are frayed so actual length = 58 inches

Please refer to the attached image for the ribbon.

A is at 0

C is at 60

B is at 2

P is the point to divide the remaining ribbon in the ratio 2:3.

Part AB of the ribbon is frayed.

BP: PC = 2:3

Let BP = 2x and PC = 3x

Now, BP + PC = BC = 58 = 2x + 3x = 5x

So,

5x =58\\\Rightarrow x =11.6

BP = 2\times x = 2 \times 11.6 = 23.2\ inches

Location of the Cut = 2 + 23.2 = <em>25.2 inches</em>

<em></em>

Alternatively, we can use the formula directly:

x = \dfrac{m} {m + n } (x_2 - x_1) + x_1

x_1 = 2\\x_2 = 60

m: n is the ratio 2:3

x = \dfrac{2} {2 +3 } (60- 2) + 2\\\Rightarrow 0.4 (58 )+2\\\Rightarrow 23.2+2 \\\Rightarrow \bold{25.2\ inches}

5 0
3 years ago
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In Autumn it goes up
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The correct answer is b
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(8-(2-2))∙9<br><br> 9<br><br> 34<br><br> 72<br><br> 118
dsp73

Answer: 72

Step-by-step explanation:

(8-(2-2))×9

First do (2-2=0)

(8-0=8)

8×9=72

Hope this helps

8 0
2 years ago
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