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3 years ago

Help please?? I’m being timed!!

Mathematics

2 answers:

Lina20 [59]3 years ago

8 0

Answer:

The last one

Step-by-step explanation:

The last one is the only possible choice

weqwewe [10]3 years ago

6 0

Answer:

answer is is option 3 all the best for examination

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Solve for<br> 16 – 2t = t +9

Anon25 [30]

16 - 2t = t + 9
t = 7/3

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3 years ago

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The point P(-4, -5) is rotated 180° counterclockwise around the origin. What are the coordinates of the resulting point, P′?

TEA [102]

The points are (4,5 ) because the rule for coordinates when rotated 180 is (-x,-y)

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3 years ago

Please solve the attached problem and chose from the answers below.

DanielleElmas [232]

Answer:

Step-by-step explanation:

$\frac{5}{4t}-\frac{t+4}{10t^2}=\frac{5\left(10t^2\right)-4t\left(t+4\right)}{40t^3}=\frac{2t\left(25t-2\left(t+4\right)\right)}{40t^3}=\frac{\left(25t-2t-8\right)}{20t^2}=\frac{23t-8}{20t^2}$

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3 years ago

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What is the best estimate of 2π²?

Rasek [7]

2π^2=19.7392088 to 20 since 19.7392088 is closer to 20.

6 0

3 years ago

Calibrating a scale:

lana66690 [7]

Answer:

We conclude that the calibration point is set too high.

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 1000 grams

Sample mean, $\bar{x}$ = 1001.1 grams

Sample size, n = 50

Alpha, α = 0.05

Population standard deviation, σ = 2.8 grams

First, we design the null and the alternate hypothesis

$H_{0}: \mu = 1000\text{ grams}\\H_A: \mu > 1000\text{ grams}$

We use One-tailed(right) z test to perform this hypothesis.

Formula:

$z_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{\sigma}{\sqrt{n}} }$

Putting all the values, we have

$z_{stat} = \displaystyle\frac{ 1001.1 - 1000}{\frac{2.8}{\sqrt{50}} } = 2.778$

Now, $z_{critical} \text{ at 0.01 level of significance } = 2.326$

Since,

$z_{stat} > z_{critical}$

We reject the null hypothesis and accept the alternate hypothesis. We accept the alternate hypothesis. We conclude that the calibration point is set too high.

6 0

3 years ago