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3 years ago

11

The temperature during the day is 6 degrees and the temperature drops 15 degrees after sunset. What is the temperature at night?

A. -9 degrees B. -6 degrees C. 9 degrees D. 21 degrees

1 answer:

Anni [7]3 years ago

8 0

I think-9 I subtracted 6-15

But I’m no sure

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A scuba diver is 31 feet below the surface of the water. She dives down an additional 16 feet. How far would she have to rise to

Karolina [17]

Answer: 47 feet

Step-by-step explanation:

Originally the scuba driver was 31 feet below the surface of the water.

She then dives down a further 16 feet. The depth below the surface is now:

= 31 + 16

= 47 feet

The Scuba driver is now 47 feet below the surface of the water so if she had to come back to the surface, she would have to rise that 47 feet to get to the surface.

6 0

3 years ago

Ill give brainliest

Savatey [412]

C. For sure. Hope it helps

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3 years ago

Two families visited an amusement park. The first family bought 2 hot dogs and 3 bottles of waters, which totaled $18. The secon

Ghella [55]

<u>Answer:</u>

$6.00

<u>Step-by-step explanation:</u>

To solve this problem, we have to construct two separate equations for each family, and then use any of the methods for solving simultaneous equations.

Let's consider <em>h </em>to represent the cost of 1 hot dog, and <em>w </em>to mean the cost of 1 water bottle.

• For the first family:

$2h + 3w = 18$

We can rearrange the equation to make <em>w</em> the subject:

⇒ $3w = 18 - 2h$

⇒ $w = \frac{18 - 2h}{3}$

• For the second family:

$4h + 2w = 28$

Since we have previously obtained an expression for <em>w</em> in terms of <em>h</em>, we can substitute that expression for <em>w</em> in the above equation, and then solve for <em>h</em>:

⇒ $4h + 2(\frac{18 - 2h}{3}) = 28$

⇒ $4h + \frac{36 - 4h}{3} = 28$

⇒ $12h + 36 - 4h = 84$ [Multiplying both sides of the equation by 3]

⇒ $8h + 36 = 84$

⇒ $8h = 48$

⇒ $h = \bf 6$

∴ The price of one hot dog is $6.00.

7 0

2 years ago

Basic Computation: Testing M1 2 M2 A random sample of 49 measurements from a population with population standard deviation 3 had

Elenna [48]

Answer:

The sample statistics follows a standard normal distribution since the sample size are large enough.

Step-by-step explanation:

Given that:

<u>First population:</u>

Sample size $n_1$ = 49

Population standard deviation $\sigma_1$ = 3

Sample mean $\overline x _1$ = 10

<u>Second population:</u>

Sample size $n_2$ = 64

Population standard deviation $\sigma_2$ = 4

Sample mean $\overline x_2$ = 12

The sample statistics follows a standard normal distribution since the sample size are large enough.

The null and alternative hypotheses can be computed as:

$\mathbf{H_o:\mu_1=\mu_2}$

$\mathbf{H_1:\mu_1\ne\mu_2}$

Level of significance = 0.01

Using the Z-test statistics;

$Z = \dfrac{\overline x_1 - \overline x_2}{\sqrt{\dfrac{\sigma_1^2}{n_1} + \dfrac{\sigma_2^2}{n_2}}}$

$Z = \dfrac{10- 12}{\sqrt{\dfrac{3^2}{49} + \dfrac{4^2}{64}}}$

$Z = \dfrac{-2}{\sqrt{\dfrac{9}{49} + \dfrac{16}{64}}}$

$Z = \dfrac{-2}{\sqrt{0.18367 +0.25}}$

$Z = \dfrac{-2}{\sqrt{0.43367}}$

$Z = \dfrac{-2}{0.658536}$

Z = - 3.037

Z $\simeq$ - 3.04

The P-value = 2P (z < -3.04)

From the z tables

= 2 × (0.00118)

= 0.00236

Thus, since P-value is less than the level of significance, we fail to reject the null hypotheses $H_o$

5 0

3 years ago

judi is making a rope ladder. she uses 1/2 yard of rope for each step. how many steps can she make with 6 yards of rope? show yo

Veseljchak [2.6K]

Answer:

12 steps.

Step-by-step explanation:

6 / (1/2)

= 12 steps

Hope this helped!

7 0

3 years ago

Read 2 more answers