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3 years ago

I dont understand this question pleade help

Mathematics

1 answer:

fenix001 [56]3 years ago

6 0

Answer:

8.9

Step-by-step explanation:

${a}^{2} + {b}^{2} = {c}^{2} \\ {(8)}^{2} + {b}^{2} = {(12)}^{2} \\ 64 + {b}^{2} = 144 \\ \sqrt{ {b}^{2} } = \sqrt{80} \\ b = 4 \sqrt{5} \: or \: 8.9$

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The time to complete a standardized exam is approximately normal with a mean of 70 minutes and a standard deviation of 10 minus.

AnnyKZ [126]

Answer:

Step-by-step explanation:

Given that the time to complete a standardized exam is approximately normal with a mean of 70 minutes and a standard deviation of 10 minutes.

P(completing exam before 1 hour)

= P(less than an hour) = P(X<60)

=P(Z< $\frac{60-70}{10} =-1$ )

=0.5-0.34=0.16

i.e. 16% of students completed the standardized exam.

7 0

3 years ago

The movie theater has 250 seats 225 seats were sold for the carriage showing what percent of seats are empty?

uysha [10]

I believe the answer is about 10 percent.

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3 years ago

Ragan makes beaded jewelry. The graph below shows the number of beads on varying cord lengths.

MakcuM [25]

Answer:

Option C) 34 inches

Step-by-step explanation:

We are given the following in the question:

The graph shows the number of beads on varying cord lengths.

The y-axis represents the number of beads and x-axis represents the cord length in inches.

The graph represents the equation:

$y = 2.52x + 1.61$

where y is the number of beads and x is the cord length.

We have to find the cord length of a necklace consisting of 88 beads.

Thus, we are given y = 88.

Putting this value in the equation, we get,

$y = 2.52x + 1.61\\88 = 2.52x + 1.61\\2.52x = 88 - 1.61\\2.52x = 86.39\\\\x = \displaystyle\frac{86.39}{2.52} = 34.28 \approx 34$

Thus, the cord length of necklace with 88 beads is approximatwly 34 inches.

8 0

3 years ago

Read 2 more answers

You are enclosing a rectangular garden with 60 feet of ornamental fencing. the area of the garden is 200 square feet. what are t

Lilit [14]

The perimeter is equal to 60 feet and has the formula:

Perimeter = 2 l + 2 w

60 = 2 l + 2 w

The area is equal to 200 square feet and has the formula:

Area = l w

200 = l w

Rewriting area in terms of l:

l = 200 / w

Combining this with the perimeter formula:

60 = 2 (200 / w) + 2 w

60 = 400 / w + 2 w

Multiplying all by w:

60 w = 400 + 2 w^2

Dividing by 2 and rearranging:

w^2 – 30 w = - 200

Completing the square:

(w – 15)^2 = - 200 + (-15)^2

(w – 15)^2 = 25

w – 15 = ±5

w = 10, 20

Hence the dimensions of the garden is 10 feet by 20 feet

5 0

4 years ago

Help please the question is on the image

madam [21]

Answer:

Step-by-step explanation:

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3 years ago