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2 years ago

What multiplication fact can you double to find 4x7

Mathematics

2 answers:

gizmo_the_mogwai [7]2 years ago

7 0

2x6 because 2x6 equals 12 and 12+12=24 ohhhhh oppps

AnnZ [28]2 years ago

5 0

You can do subtract half of 4 which is 2 and multiply by 2 by 7 so it will be 2x14 which is the same thing as 7x4

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A student makes a number of measurements of electrical current in the circuit. The average of the measurements is 12.33 mA. The

Cloud [144]

Answer:

The way to represent this it is

$12.33 - \frac{0.27}{\sqrt{n} } < \mu < 12.33 + \frac{0.27}{\sqrt{n} }$

Step-by-step explanation:

From the question we are told that

The sample mean is

The standard deviation is

Given that the confidence level is 95% then the level of significance is mathematically represented as

$\alpha = (100-95)$

$\alpha = 0.05$

The critical value for $\frac{\alpha }{2}$ is obtained from the normal distribution table that value is

$Z_{\frac{\alpha }{2} } = 1.96$

Now the margin of error is mathematically represented as

$E = Z_{\frac{\alpha }{2} } * \frac{s}{\sqrt{n} }$

$E = \frac{0.27}{\sqrt{n} }$

Now the error range to show a 95% confidence is mathematically represented as

$\= x - E < \mu < \= x + E$

$12.33 - \frac{0.27}{\sqrt{n} } < \mu < 12.33 + \frac{0.27}{\sqrt{n} }$

Here notice that the significant figure is keep to three to match the significant figure of the given values

4 0

3 years ago

A fair coin is a coin whose head and tail appears in an equal probability of 50% each. what is the probability of obtaining eith

Sergio [31]

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7 0

3 years ago

Need help please!! i will mark brainliest to whoever answers correctly <33

sergij07 [2.7K]

Answer:

x = -33

Step-by-step explanation:

To find the midpoint add the two points and divide by 2

(x+27)/2 = -3

Multiply each side by 2

(x+27)/2 *2= -3*2

x+27 = -6

Subtract 27 from each side

x+27-27 = -6 -27

x = -33

4 0

2 years ago

If 11250 = m(600) + b and 7650 = m(400) + b, how do I find the values of b and m? I forgot how to compare when I have two differ

Lelu [443]

Answer:

$b=450$ and $m=18$

Step-by-step explanation:

This exercise is an example of linear system equations. A system of linear equations is a set of (linear) equations that have more than one unknown. The unknowns appear in several of the equations, but not necessarily in all of them. What these equations do is relate the unknowns to each other.

The easy way to solve this problem is by using the reduction method.The reduction method consists of operating between the equations, such as adding or subtracting both equations, so that one of the unknowns disappears. Thus, we obtain an equation with a single unknown.

Ordering the equations as a system equations.

$\left \{ {{600m+b=11250} \atop {400m+b=7650}} \right.$

Using the reduction method, let's substract the second equation with the first equation, in order to clear m.

600m + b = 11250

-400m - b = -7650

200m = 3600 --------> m = 3600/200 -----> m = 18

We can substitute the value of m in any of the two equations to obtain the unknow b.

Let's substitute the value of m in the second equation.

400(18) + b = 7650

7200 + b = 7650 -----> b = 7650 - 7200 -------> b = 450

We can check this values in both equations.

600m + b = 11250 -----> 600(18) + 450 = 11250

400m + b = 7650 -----> 400(18) + 450 = 7650

Satisfying the result of both equations.

6 0

3 years ago

Which of the following is the conjugate of a complex number with 2 as the real part and −8 as the imaginary part?

vampirchik [111]

The complex number is given as: 2-8i

So for conjugate, you just flip the sign of the imaginary part:

2+8i will be the answer

3 0

2 years ago

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