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3 years ago

Help please!!!! I’ll appreciate it so much!

Mathematics

2 answers:

bazaltina [42]3 years ago

5 0

Answer:

13. x = 4

14. x = -16

15. x = 11

Step-by-step explanation:

skelet666 [1.2K]3 years ago

5 0

You can use photo math for the answers !

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A student repeatedly measures the mass of an object using a mechanical balance and gets the following values: 560 g, 562 g, 556

MrRissso [65]

Answer: 2.76 g

Step-by-step explanation:

The formula to find the standard deviation:-

$\sigma=\sqrt{\dfrac{\sum(x_i-\overline{x})^2}{n}}$

The given data values : 560 g, 562 g, 556 g, 558 g, 560 g, 556 g, 559 g, 561 g, 565 g, 563 g.

Then, $\overline{x}=\dfrac{\sum_{i=1}^{10} x_i}{n}\\\\\Rightarrow\ \overline{x}=\dfrac{560+562+556+558+560+556+559+561+565+563}{10}\\\\\Rightarrow\ \overline{x}=\dfrac{5600}{10}=560$

Now, $\sum_{i=1}^{10}(x_i-\overline{x})^2=0^2+2^2+(-4)^2+(-2)^2+0^2+(-4)^2+(-1)^2+1^2+5^2+3^2\\\\\Rightarrow\ \sum_{i=1}^{10}(x_i-\overline{x})^2=76$

Then, $\sigma=\sqrt{\dfrac{76}{10}}=\sqrt{7.6}=2.76$

Hence, the standard deviation of his measurements = 2.76 g

6 0

3 years ago

Which side lengths form a right triangle?

Masja [62]

Answer: choice B

Explanation: Go through each answer choice and try the Pythagorean theorem to see if it works. This is because a right triangle’s side lengths are described by the Pythagorean theorem. one side^2 + second side^2 = longest side^2. In a right triangle, this equation will be true. Let me show you what I mean

For answer choice A:

(root 2)^2 + (root 3)^2 = (root 4)^2

2 + 3 = 4

5 = 4

5 does not equal 4. Therefore it cannot be A.

For answer choice B:

(root 8)^2 + (3)^2 = (root 17)^2

8 + 9 = 17

17 = 17

this is true! therefore this is a right triangle and it’s B

3 0

2 years ago

Tom puts a cup of tea in his microwave oven He knows that the final temperature of the water will be a function of the number of

bearhunter [10]

B and C are both correct

t(s) is equivalent to the temperature of the tea after s amount of seconds

4 0

3 years ago

Carol wants to make a cake. The recipe calls for 8 1/2 cups of flour. A 16-ounce bag contains 2 cups. How many bags of flour mus

Leona [35]

Answer:

please love me

Step-by-step explanation:

please please.

5 0

2 years ago

Read 2 more answers

Which expression can be simplified as18 O (1²) 9 (9) O (no)-3 O O (n-3)⁰

sesenic [268]

Answer:

Option 4

Step-by-step explanation:

$(n^{-3})^6=n^{-18}=\frac{1}{n^{18}}$

4 0

1 year ago