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
Dvinal [7]
3 years ago
15

I need help with these two problems !!

Mathematics
1 answer:
wolverine [178]3 years ago
4 0

Not so sure about the second one, but the first one is pretty simple:

The area of a circle = pi x radius^2

Since you need to find the area of the entire dvd, I'm assuming they mean if the hole in the center wasn't there, so add that to the diameter.

12+1.5 = 13.5

Half of the diameter is the radius, so half of 13.5 = 6.75

Now, multiply pi (3.14) by the radius, but have the radius squared. You'd write the equation like this:

3.14 x 6.75^2 (or on paper, the ^2 would be a small two diagonal from the 5)

Actual answer: 143.06625

You can round that to 143.

You might be interested in
Find the change below as a percentage. Then choose whether it is a percent of incease ror a percent of decrease. Change from 22
melisa1 [442]

\dfrac{33}{22}\times100 =150

Ans: 150%, a percent of incease

7 0
2 years ago
Based on the figure, select all true equations.
Svetlanka [38]

Answer:

nose pero me entiende n verdad

5 0
2 years ago
A researcher posts a newspaper advertisement offering 520 in exchange for participation in a short study. The researcher accepts
iVinArrow [24]

Answer:

It's a valid sample because the first five people were selected to participate.

Step-by-step explanation:

True because random people who saw the advertisement responded. By chance, not every person who saw the advertisement answered, therefore it was random, but it would be more random if he decided to reject the second, fourth, sixth, and eighth person, and only the first, third, fifth, seventh, and ninth were chosen.

5 0
3 years ago
??help what is DEB?
sergij07 [2.7K]

Answer:

85°

Step-by-step explanation:

AED and DEB would add up to 180, the same goes for AEC and CEB

6 0
3 years ago
Diego went out for a walk. He walked for 20 minutes East at a rate of 5km/hour. He then turned around and walked west for 10 min
iVinArrow [24]
Positive 20 and negative 10 is a net amount of 10. 10 minutes is 1/6 of an hour. 5*1/6=5/6km
3 0
3 years ago
Other questions:
  • Which statement is a correct interpretation of the vertical line test? If only one vertical line intersects the graph at exactly
    14·1 answer
  • Write the expression 6a in words
    15·1 answer
  • How many calculations can this computer preform in one minute?
    11·1 answer
  • 4) BRAINLIEST AND 15 POINTS
    7·2 answers
  • The probability of breaking a window while playing baseball in the backyard is 0.78. What is the likelihood that a window will b
    5·1 answer
  • Help test due tonight! *no links please *
    13·2 answers
  • Write each of these as an integer or fraction. <br> a. 2 x 2³<br> b. (-2.5)²
    10·1 answer
  • Use the picture below to answer the question. The measure of angle 3 is 50 degrees. What is the measure of angle 6?
    9·1 answer
  • &gt; Which expression is equivalent to 1/3b - 7
    9·2 answers
  • Neil will pay 1/3 of a restaurant bill that is $72 including tax he decides to tip 20% on the amount he pays for the bill what i
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!