All categories

4 years ago

Help as fast as possible

Mathematics

2 answers:

AnnyKZ [126]4 years ago

6 0

49 is the answer because if hank did 9 fewer and he did 40 you would do 40 + 9

finlep [7]4 years ago

3 0

Please include the choices then msg me

You might be interested in

Find the area and perimeter of the composite shape..

Artyom0805 [142]

Area: 68

Perimeter: 50

5 0

4 years ago

A recent study by Ohio State University reported at Science Daily suggests that students with cell phones may take more risks th

777dan777 [17]

Answer:

The value of the test statistic z for this hypothesis test is -2.79

Step-by-step explanation:

Consider the provided information.

To calculate the test statistic use the formula:

$z=\frac{\hat p-p_0}{\sqrt{\frac{p_0(1-p_0)}{n}}}$

Where, z is Test statistics, n is Sample size, p₀ = Null hypothesized value and $\hat p$ = Observed proportion.

p₀ = 0.50

Thus 1-p₀= 0.50

42% responded that if they had a cell phone, thus $\hat p=0.42$

The sample size is 305.

Substitute the respective values in the above formula.

$z=\frac{0.42-0.50}{\sqrt{\frac{0.50(0.50)}{305}}}$

$z=\frac{-0.08}{\sqrt{0.00082}}$

$z=-2.79$

Hence, the value of the test statistic z for this hypothesis test is -2.79

4 0

3 years ago

Pls pls pls help me i do not get

patriot [66]

63%
28%
I am pretty sure this is it

4 0

3 years ago

A salmon is swimming in a river that is flowing downstream at a speed of 2 miles per hour. The slamon can swim 12 miles upstream

Olegator [25]

Answer:

The speed of the salmon in still water is 6 mi/h

Step-by-step explanation:

When an object moves with a speed So (So measured in still water) in a river with speed Sr:

If the object moves along the current (downstream), then the actual speed of the object will be:

S = So + Sr

If the object moves upstream, then the velocity will be:

S = So - Sr

In this case we know the speed of the river downstream is 2 mi/h

Sr = 2mi/h

And we know that the salmon can swim 12 miles upstream in the same time (T) that it can swim 24 miles downstream.

Here you need to remember the relation:

Distance = Time*Speed.

Then we know that:

24 mi = (So + 2mi/h)*T

12 mi = (So - 2mi/h)*T

Now we can take the quotient of these two equations to get:

(24mi/12mi) = ( (So + 2mi/h)*T)/((So - 2mi/h)*T)

2 = (So + 2mi/h)/(So - 2mi/h)

Let's multiply both sides by the denominator of the right part:

2*(So - 2mi/h) = (So + 2mi/h)

2*So - 4mi/h = So + 2mi/h

Now we need to isolate So, the speed of the salmon in still water:

2*So - So = 2mi/h + 4mi/h

So = 6mi/h

The speed of the salmon in still water is 6 mi/h

7 0

3 years ago

The temperature in Sheffield is -7c

Genrish500 [490]

Answer:

24c

Step-by-step explanation:

Difference= big value - small value

When minus is put side by side, it becomes a plus.

17c-(-7c)=17c+7c=24c

3 0

3 years ago