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Svet_ta [14]
2 years ago
7

A student answers ​90% of the questions on a math exam correctly. If she answers 27 questions​ correctly, how many questions are

on the​ exam?
Mathematics
1 answer:
alexandr1967 [171]2 years ago
6 0

Answer:

30 questions

Step-by-step explanation:

You can discover this by doing 27 divided by . 90 which equals 30.

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Rudolph borrowed $650 from his parents to make some repairs on his car. He promised to repay the loan by giving his parents at l
Zolol [24]
All you have to do for this one is 650 divided by 76 which is 8 but it won't go into it evenly
4 0
3 years ago
Or<br> Find the slope of the line <br> y<br> = <br> 9<br> 5<br> x<br> − <br> 9<br> 5<br> .
Elanso [62]

Answer:

Step-by-step explanation: 56776

8 0
3 years ago
What is 4 - 2x = -2
vlada-n [284]

Answer:

x=3

Step-by-step explanation:

4-2x-4=-2-4

-2x=-6

\frac{-2x}{-2}=\frac{-6}{-2}

x=3

if i can get brainliest that would be great

8 0
3 years ago
Find the average velocity of the function over the given interval.
snow_lady [41]

Answer:

Average velocity of the function over the given interval

              =  log(\frac{7}{4} ) -2

Step-by-step explanation:

<u><em>Explanation:-</em></u>

Given function y = 3/x -2 ...(i)

The average velocity of the function over the given interval

             Average velocity  = \frac{1}{b-a} \int\limits^b_a {(\frac{3}{x} -2)} \, dx

                               =    \frac{1}{7-4} \int\limits^7_4 {(\frac{3}{x} -2)} \, dx

now integrating

                           =   \frac{1}{3}( \int\limits^7_4 {(\frac{3}{x} )} \, dx-2\int\limits^7_4 {1} \, dx )

                           = \frac{1}{3} (3 (log x) - 2 x )_{4} ^{7}

                        =   \frac{1}{3}( (3 (log 7) - 14 )-(3 log 4 -8))

by using formulas

                 log a-log b = log(a/b)

  on simplification , we get                  

                 = \frac{1}{3}( (3 (log 7) -3 log 4 ) - \frac{1}{3} (6)

                = log(\frac{7}{4} ) -2

Average velocity of the function over the given interval

              =  log(\frac{7}{4} ) -2

 

 

6 0
3 years ago
Cards. A deck of 52 cards is shuffled and dealt. Find the probabilities of the following events: a) the tenth card is a queen; b
Veronika [31]

Answer:

  • 0.0374
  • 0.0010

Step-by-step explanation:

number of cards = 52

number of queen = 4

number of spades = 13

A) probability that the tenth card is a queen

drawn time (r) = 1

position of success(x) = 10th

p = 4/52

P( x,r,p) = x-1Cr-1*p^(r) * q^(x-r)

p(10,1,4/52) = 9C0(4/52)^1 * (48/52)^9 = 0.0374

B) probability the twentieth card is a spade

x = 20

r = 1

p = 13 / 52

P(20,1,26/52) = 19C0(26/52)^1 * (26/52)^19 = 0.0010

c)  The last five cards been spades

p(last five cards been spades )

p(48..52, 5, 13/52 ) = 47...52C4(13/52)^5 * (39/52)^48..52 - 5

 

4 0
3 years ago
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