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2 years ago

-1-2•[(-1)+5)} I am so lost on these math problems

Mathematics

2 answers:

nikitadnepr [17]2 years ago

5 0

Answer:

-9

Step-by-step explanation:

Use the order of operations. Do these operations in this order:

Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Note: when either multiplication and division, or addition and subtraction are there, go left to right.

Equation: -1 - 2 · {(-1) + 5}

Solve:

-1 - 2 · {(-1) + 5}
-1 - 2 · {4}
-1 - 8
-9

*Challenge*

Using the same method, see if you can solve this equation:

6 ÷ 2(1+2)

-Chetan K

Pepsi [2]2 years ago

3 0

The answer is -9 because me said so

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Suppose that the speeds of cars travelling on California freeways are normally distributed with a mean of 61 miles/hour. The hig

cricket20 [7]

Answer:

The standard deviation of the speeds of cars travelling on California freeway is 6.0088 miles per hour.

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by

$Z = \frac{X - \mu}{\sigma}$

After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we This p-value is the probability that the value of the measure is greater than X.

In this problem, we have that:

Suppose that the speeds of cars travelling on California freeways are normally distributed with a mean of 61 miles/hour. This means that $\mu = 61$ .

The highway patrol's policy is to issue tickets for cars with speeds exceeding 75 miles/hour. The records show that exactly 1% of the speeds exceed this limit. This means that the pvalue of Z when $X = 75$ is 0.99. This is $Z = 2.33$

$Z = \frac{X - \mu}{\sigma}$

$2.33 = \frac{75 - 61}{\sigma}$

$2.33\sigma = 14$

$\sigma = \frac{14}{2.33}$

$\sigma = 6.0088$

The standard deviation of the speeds of cars travelling on California freeway is 6.0088 miles per hour.

6 0

3 years ago

Find the equation of the line through the points (0, –3) and (4, 5)

vekshin1

Answer:

y=2x-3

Step-by-step explanation:

Hi there!

We are given the points (0, –3) and (4, 5)

We want to find the equation of the line between these points

There are 3 ways to write the equation of the line, yet the most common way is slope-intercept form, which is y=mx+b, where m is the slope and b is the y intercept

To write the equation of the line in this way, we need to first find the slope of the line
The slope can be found using the formula $\frac{y_2-y_1}{x_2-x_1}$ , where $(x_1, y_1)$ and $(x_2, y_2)$ are points

We already have 2 points, but let's label their values to avoid confusion and mistakes when calculating.

m= $\frac{y_2-y_1}{x_2-x_1}$

m= $\frac{5--3}{4-0}$

Simplify

m= $\frac{5+3}{4-0}$

m= $\frac{8}{4}$

Divide

m=2

We found the slope of the line.

Here is the equation of the line so far:

y=2x+b

Now let's find b

As stated before, b is the y intercept of the line, which is the point where the line passes through the y axis; the value of x at the y intercept is 0

One of the points we were given (0, -3) is actually the y intercept of the line!

The value of b is the value of y at the y intercept; in this case, b is equal to -3

Now substitute -3 as b in the equation.

y=2x-3

Hope this helps!

See more on this topic here: brainly.com/question/27172025

5 0

2 years ago

A 15% tip on a dinner bill is $3.60. How much is the bill?

ArbitrLikvidat [17]

Answer:

Step-by-step explanation:

if you add the tip it is 5 dollars

8 0

3 years ago

Please Help? It's 13-20

riadik2000 [5.3K]

You go into negative 7

7 0

4 years ago

A circle has a circumference of

Trava [24]

Answer:

The diameter is 1 unit.

Step-by-step explanation:

The formula for circumference of a circle of diameter d is C = (3.14)d, where 3.14 is a close approximation of π (pi).

Here the circumference is given and is 3.14 units. Because C = 3.14d,

the diameter of this circle is 3.14/3.14, or simply 1 (unit).

6 0

3 years ago