All categories

3 years ago

The sum of 4 times a number and 7 equals 9

Mathematics

2 answers:

mestny [16]3 years ago

7 0

Answer:n=1/2

Step-by-step explanation:

4n+7=9

-7 -7

4n=2

divide by 4 on both sides

n=1/2

Reptile [31]3 years ago

4 0

Answer:

0.5

Step-by-step explanation:

0.5 x 4 = 2, 2 + 7 = 9

You might be interested in

Multiply (2 – 71)(-1 + 47)

Serhud [2]

(2-7i)(-1+4i)
2x-1=-2
2x4i= 8i
-7ix-1=7i
-7ix4i=-28i^2

so the answer is
-2+8i+7i+28i^2
=28i^2+15i-2

:)

6 0

3 years ago

Read 2 more answers

Why do you cross-multiply when you solve proportions?

olga55 [171]

Answer:

Step-by-step explanation:

since the cross multiples are equal, you find a product and use the inverse operation as you would in an equation

Example 4 is to 36 as 3 is to X: 4/36 = 3/X --> 4*X = 3*36. Divide both sides by 4, to solve for X = 27.

is over of = percent of 100

is/of=%/100

What is 10% of 40.

is = x

x/40 = 10/100

cross mulitply 40*10= 400/100=4 x=4

4 0

2 years ago

Read 2 more answers

CAN SOMEONE HELP ME ANSWER THIS

yan [13]

<6=<1=75 {Corresponding angles} :-)

8 0

3 years ago

One hundred rats with mothers that were exposed to high levels of tobacco smoke during pregnancy were put through a simple maze.

Paul [167]

Answer:

The 90% confidence interval for pis (0.7342, 0.8658).

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

For this problem, we have that:

100 rats mothers, 80 went right. So $n = 100, \pi = \frac{80}{100} = 0.8$

90% confidence level

So $\alpha = 0.1$ , z is the value of Z that has a pvalue of $1 - \frac{0.1}{2} = 0.95$ , so $Z = 1.645$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.8 - 1.645\sqrt{\frac{0.8*0.2}{100}} = 0.7342$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.8 + 1.645\sqrt{\frac{0.8*0.2}{100}} = 0.8658$

The 90% confidence interval for pis (0.7342, 0.8658).

3 0

2 years ago

PLEASSEEE HELP OMG I WILL DO ANYTHING!!! IM BEGGING

Dafna1 [17]

Answer:

180 boxes

Step-by-step explanation:

The rate of change is 10 boxes per hour, so if you multiply 10 times 18 you will get 180 which is the answer.

8 0

3 years ago