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4 years ago

PLEASE HELP I REALLY NEED IT NOW. I WILL MARK AS BRAINLIEST

Mathematics

1 answer:

laiz [17]4 years ago

7 0

the first one is 30 and the second one is 60

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How do I factor quadratics?

nekit [7.7K]

Ok so factoring quadratics is fairly easy once you get the hang of it

So we have a quadratic $x^2+x-2$

My first question would be what 2 numbers multiply to -2 and add to +1

the answer is 2 and -1

Second question what 2 values multiply to get $x^2$

the answer x and x

your factored form would be $(x-1)(x+2)$

This is as far as i can explain there is a whole lot about quadratics to be learned. You have to ask your teacher on more information

6 0

4 years ago

24=3(n−5) n= ? Please help need ASAP

leva [86]

Answer: n = 13

Step-by-step explanation:

To find n, you can look at the equation and see that n is being multiplied by 3 to equal 24. Since 8 times 3 equals 24, you can substitute to solve:

8 = n - 5

n = 13

Therefore, through simplification, n is equal to 13.

I hope this helps!

8 0

2 years ago

Read 2 more answers

Alma is estimating the proportion of students in her school district who, in the past month, read at least 1 book. From a random

Maurinko [17]

Answer:

$(0.64 +1.645 \sqrt{\frac{0.64(0.36)}{50} })$

90 percent confidence interval for the proportion of all students in her district who read at least 1 book last month

(0.52846 , 0.75166)

Step-by-step explanation:

Step:-1

Given that the random sample size 'n' = 50

The sample proportion

$p^{-} = \frac{32}{50} = 0.64$

90 percent confidence interval for the proportion of all students in her district who read at least 1 book last month

$(p^{-} - Z_{0.90} \sqrt{\frac{p(1-p)}{n}, } , p^{-} +Z_{0.90} \sqrt{\frac{p(1-p)}{n} })$

Step(ii):-

Level of significance = 0.90

Z₀.₉₀ = 1.645

$(0.64 - 1.645 \sqrt{\frac{0.64(1-0.64)}{50}, } , 0.64 +1.645 \sqrt{\frac{0.64(1-0.64)}{50} })$

$(0.64 - 1.645 \sqrt{\frac{0.64(0.36)}{50}, } , 0.64 +1.645 \sqrt{\frac{0.64(0.36)}{50} })$

(0.64 -1.645(0.06788) , (0.64 + 1.645(0.06788)

(0.52846 , 0.75166)

Final answer:-

90 percent confidence interval for the proportion of all students in her district who read at least 1 book last month

(0.52846 , 0.75166)

5 0

3 years ago

If=y=1 z=2 (2y + z) (2y-z)

snow_tiger [21]

Answer:

answer is 0

Step-by-step explanation:

(2×1+2)(2×1-2)

(4×0)

5 0

3 years ago

What is the probability that bus 65 arrives first

Dvinal [7]

It depends how many busses there are?

6 0

4 years ago