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3 years ago

What is an open sentence in math? And how is it different from true or false?

1 answer:

5 0

An open sentence in math means that it uses variables, meaning that it is not known whether or not the mathematical sentence is true or false.

A closed sentence, on the other hand, is a mathematical sentence that is known to be either true or false

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Which geometric shape would best describe a flashlight?

pogonyaev

Answer:

cylinder

Step-by-step explanation:

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3 years ago

Read 2 more answers

1. Determine the value of x.<br> Please help

pantera1 [17]

Answer:

55..........................

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3 years ago

What is the product of sy if 2^x + 3^y = 5 and 2^x+2 + 3^y+1 = 18

Dimas [21]

I think the answer is 18 not sure though

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4 years ago

Human body temperatures are normally distributed with a mean of 37.0 degrees and a standard deviation of 0.35 degrees. If a samp

cricket20 [7]

Answer:

Step-by-step explanation:

The expected value is $n*p$ , where n=148 is the sample size and $p=P(x\:>\:37.5)$ .

We calculate the z-score of 37.5 using the formula:

$z=\frac{x-\mu}{\sigma}$

$z=\frac{37.5-37.0}{0.35}$

$z=\frac{0.5}{0.35}=1.43$

From the standard normal distribution table, the area to the left of 1.43 is 0.9236.

$\implies P(x\:>\:37.5)=1-0.9236=0.0764$ .

The expected number of people in the sample with body temperatures above 37.5 degrees is $0.0764*148=11.3072=12$

We don't have a fractional human being, so the rule of thumb is to round up.

4 0

3 years ago

Read 2 more answers

∠A and \angle B∠B are complementary angles. If m\angle A=(x-21)^{\circ}∠A=(x−21) ∘ and m\angle B=(2x-15)^{\circ}∠B=(2x−15) ∘ , t

sasho [114]

Answer:

A = 21 degrees

Step-by-step explanation:

Here in this question, we are told to calculate the value of angle A.

When two angles are tagged complementary, what this means is that the addition of both angles gives a total of 90 degrees.

Hence;

A + B = 90

This means that;

(x-21) + (2x -15) = 90

x + 2x -21-15 = 90

3x -36 = 90

3x = 90+ 36

3x = 126

x = 126/3

x = 42

But we are told to calculate the measure of A

A = x -21

A = 42-21

A = 21 degrees

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4 years ago