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AlekseyPX
3 years ago
5

A lady can solve 3 math problems in 4 minutes she is half an hour before soccer practice to work on her math homework and talked

her friends. she has 20 math questions for homework and she wants to complete them before talking with her friends how many of minutes will shot no have to complete her homework. I could not find the answer for the life of me and how?!?
Mathematics
1 answer:
sertanlavr [38]3 years ago
3 0

Answer:

she can complete 20 math problems in 26 mins and 40 secs . she has 3 mins and 20 secs to talk to her friends

Step-by-step explanation:

She can solve 3 math problems in 4 mins

She can solve 1 math problem in = 4/3 *60 minutes= 80 secs

She has to solve 20 math problems = 20*80= 1600 secs/60= 26 mins and 40 secs.

She has 3 minutes and 20 secs to talk to her friends.

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Is w^2-9w+81 a trinomial square
Yuri [45]
No because it would be
if you knew that
ax^2+bx+c was a trinomial square, then the factored form would be
( \sqrt{a}x+ \sqrt{c})^{2} or ( \sqrt{a}x- \sqrt{c})^{2}
so
if w^2-9w+81 is perfect square, factored form is either
( \sqrt{1}x+ \sqrt{81})^{2} or ( \sqrt{1}x- \sqrt{81})^{2}  aka ( x+9)^{2} or  ( x-9)^{2}
expand them
(x+9)^2=x^2+18x+81, wron middle term

(x-9)^2=x^2-18x+81 wrong

so it is not






8 0
4 years ago
What is the probability that 1 or 2 are rolled on a number cube with sides numbered 1, 2, 3, 4,
choli [55]

Answer: \frac{1}{3}

Step-by-step explanation:

total sides = 6

p (rolling a 1) = \frac{1}{6}

p (rolling a 2) = \frac{1}{6\\}

Note:

or - add

and - multiply

∴ \frac{1}{6} +\frac{1}{6} = \frac{2}{6}

∴ \frac{2}{6} = \frac{1}{3}

hence, p (rolling a 1 or 2) = \frac{1}{3}

4 0
3 years ago
Help pleaseeeeeee !!!
xxMikexx [17]

Answer:

Step-by-step explanation:

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5 0
3 years ago
Read 2 more answers
What is what is the anwser 34.78x0.12
maks197457 [2]

Answer: 4.1736

Step-by-step explanation:

Simply multiply 34.78 and 0.12 together.

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4 0
2 years ago
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Assume that the weight of two year old babies have distribution that is approximately normal with a mean of 29 pounds and a stan
Lana71 [14]

Answer:

25.15 ponds is the weight of two year old baby corresponds to 10th percentile.      

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 29 pounds

Standard Deviation, σ = 3 pounds

We are given that the distribution of weight of two year old babies is a bell shaped distribution that is a normal distribution.

Formula:

z_{score} = \displaystyle\frac{x-\mu}{\sigma}

We have to find the value of x such that the probability is 0.10

P(X < x)  

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Calculation the value from standard normal z table, we have,  

P(z < -1.282) = 0.10

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Thus, 25.15 ponds is the weight of two year old baby corresponds to 10th percentile.

5 0
4 years ago
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