1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Galina-37 [17]
3 years ago
9

The sum of twice a number and 7 is -19

Mathematics
2 answers:
Neporo4naja [7]3 years ago
8 0

Answer:

The number is:

-13

Step-by-step explanation:

2a+7 = -19

2a = -19 -7

2a = -26

a = -26/2

a = -13

Check:

2*-13 + 7 = -19

-26 + 7 = -19

adoni [48]3 years ago
4 0

Answer:

The number will be -13

Step-by-step explanation:

Let the no. be x

Its twice will be = 2x

According to the question ,

2x + 7 = -19\\=> 2x = -19 - 7 = -26\\=> x = \frac{- 26}{2} = - 13

You might be interested in
A sitting space is planned for a new entertainment district in a city. The table shows the relationship between the area, in squ
Ksivusya [100]

Answer:

975Ft

Step-by-step explanation:

3 0
3 years ago
The sum of two numbers is 83 if one of the number is 7 more than the other find the two numbers?​
viva [34]

Answer:

48.5 and 34.5

Step-by-step explanation:

83 divided by 2 and then subtract 7

3 0
3 years ago
Read 2 more answers
2. Suppose over several years of offering AP Statistics, a high school finds that final exam scores are normally distributed wit
nirvana33 [79]

Answer:

By the Central Limit Theorem, the mean is 78, the standard deviation is s = \frac{6}{\sqrt{n}} and the shape is approximately normal.

Step-by-step explanation:

Central Limit Theorem

The Central Limit Theorem establishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

Mean of 78 and a standard deviation of 6

This means that \mu = 78, \sigma = 6

Samples of n:

This means that the standard deviation is:

s = \frac{\sigma}{\sqrt{n}} = \frac{6}{\sqrt{n}}

What are the mean, standard deviation, and shape of the distribution of x-bar for n?

By the Central Limit Theorem, the mean is 78, the standard deviation is s = \frac{6}{\sqrt{n}} and the shape is approximately normal.

6 0
3 years ago
HELP ASAP! PLS!! The Water Department checks the city water supply on a regular basis for
aleksandr82 [10.1K]

Answer:

B. 95% confident the average concentration of PCBs in the water supply is between 2.9 ppb and 3.5 ppb

Step-by-step explanation:

You are given the total number of samples, the concentration of lead, and the standard deviation. The standard deviation represents how inaccurate the estimation of the concentration of lead in the drinking water. This means that there can only possibly be a 0.3 ppb error in the estimation. 3.2-0.3=2.9, and 3.2+0.3=3.5

8 0
3 years ago
Read 2 more answers
P-6= -5 can u slove this equation plx
torisob [31]
So u have to solve for p to do that you must isolate p by moving -6 after the equal sign -5+6=1 and there is the answer: 1 hope this helps!!

5 0
3 years ago
Other questions:
  • 1.
    7·1 answer
  • Heres a set of questions. You have to determine what the variable is. variable= A letter.
    14·1 answer
  • Consider two events such that P(A) = 1/3, P(B) = 4/5, and P(A ∩ B) = 4/15. Are events A and B independent events?
    13·1 answer
  • Identify the explanatory and response variables in the following situation:
    11·1 answer
  • I don’t understand any of this
    11·1 answer
  • A candy company provides samples of fudge and truffles to their store visitors. The manager authorized the store to distribute u
    12·1 answer
  • Which product is equivalent to 25x2 – 16?
    11·2 answers
  • A secant and a tangent meet at a 90° angle outside the circle. What must be the difference between the measures of the intercept
    9·1 answer
  • -1 /-26 simplified
    6·2 answers
  • Please help.. no links​
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!