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4 years ago

Rewrite the equation by completing the square. 2x2 + 7x + 6 = 0

Mathematics

2 answers:

Andrews [41]4 years ago

8 0

Fhdhdnddndnddbdjcjcjcjc j CBC channel

Ksivusya [100]4 years ago

4 0

9x+8=0 this the answer

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Jada walks up to a tank of water that can hold up to 10 gallons. When it is active, a drain empties

Romashka-Z-Leto [24]

Answer:

3 minutes and 30 seconds

Step-by-step explanation:

7-5 = 2

3/2 = 1.5 gallons that empty per each minute

1.5 times 3 (minutes) = 4.5 gallons emptied

Remaining gallons to empty = 0.5

0.5 gallons to empty will take 30 seconds

I hope this helps :)

8 0

3 years ago

Independent random samples from two regions in the same area gave the following chemical measurements (ppm). Assume the populati

Basile [38]

Answer:

d. The interval contains only negative numbers. We cannot say at the required confidence level that one region is more interesting than the other.

Step-by-step explanation:

Hello!

You have the data of the chemical measurements in two independent regions. The chemical concentration in both regions has a Gaussian distribution.

Be X₁: Chemical measurement in region 1 (ppm)

Sample 1

n= 12

981 726 686 496 657 627 815 504 950 605 570 520

μ₁= 678

σ₁= 164

Sample mean X[bar]₁= 678.08

X₂: Chemical measurement in region 2 (ppm)

Sample 2

n₂= 16

1024 830 526 502 539 373 888 685 868 1093 1132 792 1081 722 1092 844

μ₂= 812

σ₂= 239

Sample mean X[bar]₂= 811.94

Using the information of both samples you have to determina a 90% CI for μ₁ - μ₂.

Since both populations are normal and the population variances are known, you can use a pooled standard normal to estimate the difference between the two population means.

[(X[bar]₁-X[bar]₂)± $Z_{1-\alpha /2}$ * $\sqrt{\frac{Sigma^2_1}{n1}+\frac{Sigma^2_2}{n_2} }$ ]

$Z_{1-\alpha /2}= Z_{0.95}= 1.648$

[(678.08-811.94)±1.648* $\sqrt{\frac{164^2}{12}+\frac{239^2}{16} }$ ]

[-259.49;-8.23]ppm

Both bonds of the interval are negative, this means that with a 90% confidence level the difference between the population means of the chemical measurements of region 1 and region 2 may be included in the calculated interval.

You cannot be sure without doing a hypothesis test but it may seem that the chemical measurements in region 1 are lower than the chemical measurements in region 2.

I hope it helps!

6 0

4 years ago

What value of m satisfies the equation<br> m-2=2-m?<br>

zhuklara [117]

Hello,

Answer: m = 2

Step-by-step explanation:

m - 2 = 2 - m

⇔ m - 2 + m = 2 - m + m

⇔ 2m - 2 = 2

⇔ 2m - 2 + 2 = 2 + 2