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3 years ago

What is the solution to this equation x-9=17

Mathematics

1 answer:

Alja [10]3 years ago

6 0

Answer:

Step-by-step explanation:

you add 17+9 and get 26.

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0.5-3(0.5+1) with a power of 2

Inessa [10]

Answer: -6.25

Step-by-step explanation: 0.5 -3(0.5+1)^2

=0.5 -3(1.5)^2

= 0.5 -3(2.25)

= 0.5-6.75

= -6.25

6 0

3 years ago

What are the common factors of 12 and 24?

Brut [27]

Common factors of 12 and 24 include 2,3,4,6, and 12

8 0

3 years ago

Read 2 more answers

A study was conducted to measure the effectiveness of hypnotism in reducing pain. The measurements are centimeters on a pain sca

inna [77]

Answer:

Step-by-step explanation:

Hello!

This is an example of a pared sample test, the experiment is based on two dependent variables:

X₁: centimeters on a pain scale before hypnosis

X₂: centimeters on a pain scale after hypnosis

Out of these two variables a new variable is determined Xd= X₁-X₂

If the variables have an approximate normal distribution then the variable resulting from their difference will also have an approximate normal distribution.

The claim is that "hypnosis reduced the pain" if so you'd expect the population mean of the difference to be less than zero, symbolically: μd<0

The statistic for this test is a paired sample t test:

$t= \frac{\frac{}{X_d} - Mu_d}{Sd} ~t_{n-1}$

To calculate the sample mean and variance you have to calculate the difference between the pairs first.

$\frac{}{Xd}$ = ∑Dif/n

$S_d^2= \frac{1}{n-1} [sumDif^2- \frac{(sumDif)^2}{n} ]$

∑Dif= 6.4

∑Dif²= 12.64

$\frac{}{Xd}$ = 6.4/5= 1.28

$S_d^2= \frac{1}{4} [12.64- \frac{(6.4)^2}{5} ]= 1.112$

Sd= 1.05

$t_{H_0}= \frac{\frac{}{Xd}-Mu_d }{Sd} = \frac{1.28-0}{1.05} = 1.219= 1.22$

I hope this helps!

7 0

4 years ago

A log raft is moving downstream at a speed of 3 km/h. To insure that there are no river jams a supervisor travels along the raft

skad [1K]

Answer:

2000 meters

Step-by-step explanation:

When the motorboat is moving downstream, its speed relative to the ground is 18 km/h, so its speed relative to the raft is 15 km/h.

When the motorboat is moving upstream, its speed relative to the ground is 12 km/h, so its speed relative to the raft is again 15 km/h.

Converted to m/min, the relative speed is:

15 km/h × (1000 m/km) × (1 h / 60 min) = 250 m/min

It takes the motorboat 16 minutes to travel to the front of the raft and back. Since the speed is the same in both directions, the motorboat takes 8 minutes to travel the length of the raft.

So the length of the raft is 250×8 = 2000 meters.

8 0

4 years ago

How many triangles exist with the given side lengths? 13, 15, 17

aksik [14]

Answer:

Step-by-step explanation:

13, 15, 27 and 13, 27, 15

you could rearrange the order but they would still be the same two triangles in different rotated positions:

15, 13, 27 is the same as 13, 27, 15, just rotated

15, 27, 13 is the same as 13, 15, 27, just rotated

27, 13, 15 is the same as 13, 15, 27, just rotated

27, 15, 13 is the same as 13, 27, 15, just rotated

7 0

3 years ago