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AnnZ [28]
2 years ago
15

6. Leveled Practice Resting heart rate is a measure of how

Mathematics
1 answer:
Luden [163]2 years ago
5 0

Answer:

       280-4        276

m is ---------- =  ---------

       140-2          138

y= 2x

The heart's resting heart rate is 2 beats each minute

Step-by-step explanation:

280-4=276

140-2=138

276/138=2 <--- division

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6x7-8/4 using the order of operations will reward 10 pts best answer will be marked brainliest.
Phantasy [73]

Answer:

40

Step-by-step explanation:

6x7-8/4 =42 - 2 = 40

8 0
3 years ago
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
3 years ago
Shawn bought a hat for $17.00, shorts for $24.00 and a shirt for $12.00. How much did he spend in all?
lakkis [162]

Answer:

$53

Step-by-step explanation:

17+24=41

41+12=53

3 0
3 years ago
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I need help please ​Will mark brainliest
natima [27]

Answer:

which ones do you need answered

Step-by-step explanation:

7 0
2 years ago
If a silver alloy that costs $4.50 an ounce is
Nitella [24]

6.5X + 9(30) = 8(30+X)6.5X +270 = 240 + 8X270-240 = 8X-6.5X1.5X = 30X = 30/1.5 =20 ounces of $6.50 alloy9 is within 1 of 86.5 is within 1.5 of 81.5 is 3/2 of 130 is 3/2 of 20You know you need more of $9 alloy since it's closer to $8You need exactly 3/2 or 1.5 times more of the $9 alloy30 is 1.5 times 20

5 0
2 years ago
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