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Tanya [424]
3 years ago
5

What is the product of a+3 and −2a2+15a+6b2?

Mathematics
2 answers:
Lady bird [3.3K]3 years ago
7 0

Answer:

c. 2a3+9a2+45a+6ab2+18b2

Step-by-step explanation:

(a+3) + (−2a2+15a+6b2)

Using distributed p. with and a and 3

a(−2a2) + a(15a) +a(6b2)        and       3(−2a2) + 3(15a) + 3(6b2)

= -−2a3 + 15a2 + 6ab2                          = -6a2 + 45a + 18b2

Now add like terms and put in standard form.

15a2+(-6a2) = 9a2  

And equals

-2a3 + 9a2+45a+6ab2+18b2

Trust me I took the test and got 100%

Your welcome,

bulgar [2K]3 years ago
4 0

Answer:

C

Step-by-step explanation:

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Using 3.14 for 7, a sphere has a volume of 904.32 mm.
Alla [95]

Answer:

v =  \frac{4}{3} \pi {r}^{3 }  \\ 904.32 =  \frac{4}{3}  \times 3.14 \times   {r}^{3}   \\  {r}^{3}  =  \frac{3 \times 904.32}{4 \times 3.14}  = 21.57 \\ r = 2.78

then Radias equal to 5.5676

Step-by-step explanation:

I can help you solve what you want in mathematics in exchange for some money. If you want to, you can inform me about it and I will help you.

7 0
2 years ago
If Karri takes a 7 question true false test and guess on every question, what is the
dusya [7]

Answer:

The  probability that she gets all 7 questions correct is 0.0078.

Step-by-step explanation:

We are given that Karri takes a 7 question true-false test and guess on every question.

The above situation can be represented through binomial distribution;

P(X = r) = \binom{n}{r} \times p^{r} \times (1-p)^{n-r} ; x = 0,1,2,3,........        

where, n = number of samples (trials) taken = 7 question

            r = number of success = all 7 questions correct

            p = probability of success which in our question is probability that

                   question is correct, i.e. p = 50%

Let X = <u><em>Number of question that are correct</em></u>

So, X ~ Binom(n = 7, p = 0.50)

Now, the  probability that she gets all 7 questions correct is given by = P(X = 7)

         P(X = 7)  =  \binom{7}{7} \times 0.50^{7} \times (1-0.50)^{7-7}

                        =  1 \times 0.50^{7} \times 0.50^{0}

                        =  <u>0.0078</u>

6 0
3 years ago
A pound of fertilizer covers 42 square feet of lawn. Vivian Bulgakov’s lawn measures 8720.1 square feet. How much fertilizer, to
vazorg [7]
Answer: 8,762.1 . The nearest tenth of a pound should be 2, the decimal throwing me off
5 0
2 years ago
When 8 is subtracted from Ollie’s age, the result is the same as subtracting 16 from 3 times his age.
Scilla [17]
X - Ollie's age

8 is subtracted from Ollie's age = x-8
the result is the same as
subtracting 16 from 3 times his age = 3x-16

x-8=3x-16 \\&#10;x-3x=-16+8 \\&#10;-2x=-8 \\&#10;x=4

Ollie is 4 years old.
5 0
2 years ago
Read 2 more answers
What is the best estimate of 42% of 756?<br><br> a)320<br><br> b)240<br><br> c)400<br><br> d)400
nataly862011 [7]
320 i believe... the original answer was 317.52
4 0
2 years ago
Read 2 more answers
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