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solniwko [45]
3 years ago
13

At a local high school, 40% of the students drink soda regularly, 30% of the students drink coffee regularly, and 10% of the stu

dents drink both regularly. If a
student is randomly selected from this school, what is the probability that the student drinks soda or coffee regularly?
A. 70%
B. 20%
C. 80%
D. 60%
Mathematics
2 answers:
Savatey [412]3 years ago
8 0

Answer:

c

Step-by-step explanation:

Georgia [21]3 years ago
4 0

Answer:

c he is your answer dear friend‍♀️‍♀️

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How many complex zeros does the polynomial function have?<br> f(x)=−3x^6−2x^4+5x+6
REY [17]

one way would be to factor

I can't factor it so we will have to use Descartes' Rule of Signs which is helpful for finding how many real roots you have


it goes like this:

for a polynomial with real coefients, consider f(x)=-3x^6-2x^4+5x+6.

after arranging the terms in decending order in terms of degree, count how many times the signs of the coeffients change direction and minus 2 from that number until you get to 1 or 0. that will be the number of even roots the function can have

We have (-, -, +, +). the signs changed 1 times, so it has 1 real positive root


to get the negative roots, we evaluate f(-x) and see how many times the root changes

f(-x)=-3x^6-2x^4-5x+6

signs are (-, -, -, +). there was 1 change in sign

so the function has 1 real negative root



a total of 2 real roots


a function of degree n can have at most, n roots


our function is degree 6 so it has 6 roots

if 2 are real, then the others must be complex

6-2=4 so there are 4 complex roots


you can also show that there are only 2 real roots by using a graphing utility to see that there are only 2 real roots

7 0
3 years ago
the hypotenuse of a triangle is one foot more than twice the length of the shorter legal. the longer leg is seven feet longer th
wolverine [178]
8, 15, 17

You can do this by using the Pythagorean Theorem and setting the sides equal to

shorter leg = x
longer leg = x + 7
hypotenuse = 2x + 1

Then solve so that one side is equal to zero and use the quadratic formula.
6 0
3 years ago
Read 2 more answers
David is watching maria and alma race electric trains around track. Maria train can go around the track in 10 seconds. Almas tra
Nady [450]

Answer:

60 seconds.  

Step-by-step explanation:  

We have been given that Maria train can go around the track in 10 seconds. Alma train can go around the track in 12 seconds.

To find the number of seconds after which both trains will cross the finish line together the first time we will find LCM of 10 and 12. LCM will give us the smallest positive integer that is divisible by both 10 and 12.  

Multiples of 10 are: 10, 20, 30, 40, 50, 60, 70,...    

Multiples of 12 are: 12, 24, 36, 48, 60, 72, 84,..  

We can see that least common multiple of 10 and 12 is 60, therefore, it will take 60 seconds for both trains to cross the finish line together the first time.

6 0
3 years ago
People are surveyed about what sports they play. The results are shown in the frequency table. What graph would best display the
Marrrta [24]

Answer: Bar Graph

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
35 hundreds = 5 tens times 7 tens is it true or false
Strike441 [17]
True
if you add an imaginary 0 to the numbers since its in the tenths place you would get 3,500
5(0) x 7(0) = 3,500
3 0
3 years ago
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