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3 years ago

if a clocks second hand is 7 in. long , how many feet does it travel in 24 hr? how many miles does it travel?

Mathematics

1 answer:

frozen [14]3 years ago

7 0

Answer: Question 1 - 15 ft is how it travels. Question 2 - 95 miles is what it travels.

Step-by-step explanation: Question 1 - 15 ft is how it travels, it goes really slow and then fast.

Question 2 - 95 miles is what it travels because you got the short hand, the hour hand, the long hand, the minute hand. It goes really slow and then really fast.

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Which represents the solution(s) of the system of equations, y + 4 = x2 and y-x=2? Determine the solution set by

Sergeu [11.5K]

Answer:

The points (-2, 0) and (3,5) are the ONLY solutions of the given sets of equations.

Step-by-step explanation:

Here, the given equations are: $y + 4 = x^{2} , y -x = 2$

Now checking for the given points:

(a) (-2, 0)

Here, $y + 4 = 0 + 4 = 4 = (-2)^{2} = x^{2} \\y- x = 0 -(-2) = 2 = RHS$

Hence, (-2, 0) is the solution of the given equations.

b) Checking for (2,0), as (-2, 0) is a solution as shown above

Here, $y + 4 = 0 + 4 = 4 = (2)^{2} = x^{2} \\y- x = 0 + (-2) = -2 \neq 2(RHS)$

Hence, (2, 0) is NOT the solution of the given equations.

c) Checking for (3,5), as (-2, 0) is a solution as shown above

Here, $y + 4 = 5 + 4 = 9 = (3)^{2} = x^{2} \\y- x = 5 -3 = 2 - (RHS)$

Hence, (3,5), is the solution of the given equations.

Hence, the points (-2, 0) and (3,5) are the ONLY solutions of the given sets of equations.

5 0

4 years ago

A researcher wanted to determine whether certain accidents were uniformly distributed over the days of the week. The data show t

Cloud [144]

Answer:

Chi-square = 4.600

Degrees of freedom= 6

there is no evidence to reject hypothesis.

Step-by-step explanation:

H₀ : uniformly distributed

H₁: not uniformly distributed

Suppose some value of observed or expected frequency

Observed frequency : 39 40 30 40 41 49 41 Total: 280

Expected frequency : 40 40 40 40 40 40 40 Total: 280

Calculated the chi-square value

Chi-square = sigma {(O-E)^2/E}

= 0.025+0.000+2.500+0.000+0.025+2.025+0.025

4.600

Degrees of freedom=d f = n-1 = 7-1 = 6

Chi-square for 6 d.f at alpha = 0.05 is 12.59

Chi-square of calculated value < its critical value at alpha = 0.05, we see that there is no evidence to reject hypothesis.

The frequency of Sat is wrongly taken as 41 instead of 51

8 0

3 years ago

Is 3,4,5 a Pythagorean triple

son4ous [18]

Answer:

Yes because it fits the Pythagorean Theorem

Step-by-step explanation:

see: 5 ^2 = 25

and 3^2 + 4^2 = 9 + 16 = 25

25 = 25

so it is

8 0

3 years ago

PLEASE HELP!!! GIVING 40 POINTS!!!

Jobisdone [24]

Answer:

a no solution

b is all real numbers

c x=12

Step-by-step explanation:

a has no values of x that make it true

b any value of x makes it true

c simplify both sides of the equation then isolate x

4 0

3 years ago

the 5th and 6th grade students at jackson middle school are going on a field trip. there are 6 classes in the fitth grade, and e

Mariulka [41]

No because there are 20 multiplied by 3 is 60. So the answer would be 60+144=204x12=2448 but the last answer was still correct

4 0

3 years ago