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
iogann1982 [59]
3 years ago
7

What is the sum of 4.9 × 102 and 6.8 × 103?

Mathematics
1 answer:
dusya [7]3 years ago
6 0

Answer:

The sum is

7.92\times 10^3

Step-by-step explanation:

We want to add

4.9\times 10^2 and 6.8\times 10^3

The sum of these two numbers is:

4.9\times 10^2 +6.8\times 10^3

This is the same as:

4.9\times 100 +6.8\times 1000

490 +6800=7290

We rewrite 7290 in standard form to get;

7.92\times 10^3

You might be interested in
A number D is less than or equal to 2 and greater than or equal to negative 2
Alenkinab [10]

D \le 2

D \ge -2

-2 \le D

-2 \le D \le 2

Answer: -2 ≤ D ≤ 2


4 0
3 years ago
An image point of a tranformation has coordinates Y'(2, -4). If the pre-image point had coordinates Y(6, -12) what was the trans
galina1969 [7]
Dilation with a scale factor 1/3. the original points are three times as big as the transformed points, so the transformation needed to reduce the size by three times smaller.
6 0
2 years ago
A normally distributed set of numbers has a mean of 75 and a standard deviation of 7.97. What percentage of values lies between
lana [24]

Answer:

63% of the values lies between 70 and 85.

Step-by-step explanation:

We are given that a normally distributed set of numbers has a mean of 75 and a standard deviation of 7.97.

<em>Let X = Set of numbers</em>

The z-score probability distribution for is given by;

                Z = \frac{  X -\mu}{\sigma}  ~ N(0,1)

where, \mu = mean value = 75

            \sigma = standard deviation = 7.97

The Z-score measures how many standard deviations the measure is away from the mean. After finding the Z-score, we look at the z-score table and find the p-value (area) 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.

So, percentage of values that lies between 70 and 85 is given by = P(70 < X < 85) = P(X < 85) - P(X \leq 70)

   P(X < 85) = P( \frac{  X -\mu}{\sigma} < \frac{  85-75}{7.97} ) = P(Z < 1.25) = 0.89435  {using z table}

   P(X \leq 70) = P( \frac{  X -\mu}{\sigma} \leq \frac{  70-75}{7.97} ) = P(Z \leq -0.63) = 1 - P(Z < 0.63)

                                                 = 1 - 0.73565 = 0.26435

<em>Now, in the z table the P(Z </em>\leq<em> x) or P(Z < x) is given. So, the above probability is calculated by looking at the value of x = 1.25 and x = 0.63 in the z table which has an area of 0.89435 and 0.73565 respectively.</em>

Therefore, P(70 < X < 85) = 0.89435 - 0.26435 = 0.63 or 63%

<em>Hence, 63% of the values lies between 70 and 85.</em>

6 0
3 years ago
What is the value of this expression when a=4, b=-5, and c=-7?
nasty-shy [4]

Answer: C. 6 1/6

Step-by-step explanation:

2 * -5 * -7 = -10 * -7 = 70

70 + 4 = 74

3 * 4 = 12

74/12 = 6 1/6

4 0
3 years ago
HOW DO I FIND THE SQUARE ROOT OF A NUMBER !?!?!?!?!<br><br> TXT ME TOO
r-ruslan [8.4K]
Find out what number times it's self equals the number you need to find the square root of and that's the square root
5 0
2 years ago
Read 2 more answers
Other questions:
  • Find the Value of x in the problem
    6·1 answer
  • A pitcher has 16 cups of water in it. During the day, Aditi drank 5⁄2 cups, Kavitha drank 15⁄4 cups, and Rahul drank 33⁄8 cups.
    14·2 answers
  • 1 square kilometre equals to 100000000000 square centimetres Express it in scientific notation​
    15·1 answer
  • ..solve the following as fast as
    6·1 answer
  • Help me please and thank you​
    8·1 answer
  • Help pls &lt;3<br> a1 = −3/2<br> an = an−1 + 1/2<br><br> What is a9?
    12·1 answer
  • PLEASE HELP WILL GIVE 40 POINTS
    7·2 answers
  • Marking brainliest <br><br> What do you thinks this means and why does it matter
    11·1 answer
  • Whos right? And why?
    5·1 answer
  • I’ll give brainliest pls do all 3
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!