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jeka57 [31]
3 years ago
6

Joe is making lunch for his crew. Joe took 3 hours to prepare the vegetables. The vegetables were made up of 9 kilograms. How lo

ng do you think it will take Joe to prepare 30 kilograms of vegetables?
Mathematics
1 answer:
rusak2 [61]3 years ago
8 0

Answer:

10 hours to make 30 kilograms

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Noam chose 3 songs from a pile of 20 songs to play at a piano recital. What is the probability that she chose The Entertainer, S
OverLord2011 [107]

Answer:

3/20

Step-by-step explanation:

She chose 3 songs out of twenty so those three songs should be out of that twenty.

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2 years ago
Find the area of the trapezoid.
vekshin1

Answer:

18

Step-by-step explanation:

7 - 5 = 2

triangle = bh/2

triangle = 2(3) / 2

triangle = 3

rect = bh

rect = 3 x 5

rect = 15

trapezoid = 15 + 3

trapezoid = 18

8 0
2 years ago
Type the correct answer in each box. Use numerals instead of words. If necessary, use / for the fraction bar(s).
sineoko [7]

Answer:

The value of x =2 and y= 2, because they are congruent and 2+2=4

3 0
2 years ago
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Silicon wafers are scored and then broken into the many small microchips that will he mounted into circuits. Two breaking method
antoniya [11.8K]

Answer:

a

The estimate is  - 0.0265\le  K \le  0.0465

b

Method B this is because the faulty breaks are less

Step-by-step explanation:

The number of microchips broken in method A is  n_1 = 400

The number of faulty breaks of method A is  X_1 = 32

 The number of microchips broken in method B is  n_2  = 400

 The number of faulty breaks of method A is  X_2 = 32

  The proportion of the faulty breaks to the total breaks in method A is

       p_1 = \frac{32}{400}

      p_1 = 0.08

 The proportion of the faulty to the total breaks in method B is

      p_2 =  \frac{28}{400}

     p_2 =  0.07

For this estimation the standard error is  

      SE =  \sqrt{ \frac{p_1 (1 - p_1)}{n_1}  + \frac{p_2 (1- p_2 )}{n_2} } }

  substituting values

       SE =  \sqrt{ \frac{0.08 (1 - 0.08)}{400}  + \frac{0.07 (1- 0.07 )}{400} } }

      SE = 0.0186

The z-values of confidence coefficient of 0.95 from the z-table is  

       z_{0.95} =  1.96

The difference between proportions of improperly broken microchips for the two breaking methods is mathematically represented as

        K = [p_1 - p_2 ] \pm z_{0.95} * SE

substituting values

        K = [0.08 - 0.07 ] \pm 1.96 *0.0186

         K  =  - 0.0265 \ or  \ K  =  0.0465

The interval of the difference between proportions of improperly broken microchips for the two breaking methods is  

      - 0.0265\le  K \le  0.0465

3 0
2 years ago
Please help!!!! Whoever answers these three questions correctly first will get brainliest answer!!!!!
inna [77]
4. -8
5. 24
6. I can't see it properly so if it's ÷ answer is 9 if it's - answer is -70
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2 years ago
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