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1 year ago

Concrete blocks are 8in. high. if a 3/8-in. mortar joint is used, how high will a wal of 12 courses of concrete blocks be?

Mathematics

1 answer:

Over [174]1 year ago

8 0

Answer:

100.5 inches

Step-by-step explanation:

If each course has 3/8 inch of concrete below it (including the bottom one)

8 in * 12 + 3/8 in * 12 = 100 1/2 inches

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A poll agency reports that 75% of teenagers aged 12-17 own smartphones. A random sample of 234 teenagers is drawn. Round your an

GalinKa [24]

Answer:

If our random variable of interest for this case is X="the number of teenagers between 12-17 with smartphone" we can model the variable with this distribution:

$X \sim Binom(n=234, p=0.75)$

And the mean for this case would be:

$E(X) =np = 234*0.75= 175.5$

And the standard deviation would be given by:

$\sigma =\sqrt{np(1-p)}= \sqrt{234*0.75*(1-0.75)}= 6.624$

Step-by-step explanation:

If our random variable of interest for this case is X="the number of teenagers between 12-17 with smartphone" we can model the variable with this distribution:

$X \sim Binom(n=234, p=0.75)$

And the mean for this case would be:

$E(X) =np = 234*0.75= 175.5$

And the standard deviation would be given by:

$\sigma =\sqrt{np(1-p)}= \sqrt{234*0.75*(1-0.75)}= 6.624$

3 0

3 years ago

Which is a factor of x2 – 9x + 14? x – 9 x – 2 x + 5 x + 7

bija089 [108]

$x^2-9x + 14 = \boxed{\bf{(x-2)(x-7)}}$

Your answer is x - 2.

8 0

3 years ago

Read 2 more answers

Three eighths of the 32 children in the club were girls. How many boys were in the club?

vivado [14]

Answer:

Step-by-step explanation:

3/8* 32= 12

32-12=20

12 Girls

20 Boys

8 0

2 years ago

Read 2 more answers

All the fudge machines at a chocolate factory work at the same rate. Six machines working simultaneously can complete a big orde

Andrews [41]

5.5 I think hope this helps

4 0

2 years ago

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Which of the following angles is in the solution set of sec^2θ - 3secθ - 2 = 0 for 0° ≤ θ < 360°.

STALIN [3.7K]

1 / cos^2 O - 3 / cos O - 2 = 0
1 - 3 cos O - 2 cos^2 O = 0

2 cos^2 O + 3 cos O - 1 = 0

cos O = 0.2807 , -1.78 ( -1.78 cannot be a solution)

O = 74 degrees (from 0.2807) another solution is 360-74 = 286 degrees

Its D

4 0

2 years ago