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3 years ago

(Geometry A) Review Of Reasoning And Proof Quiz

Mathematics

2 answers:

Ne4ueva [31]3 years ago

8 0

1. If it is not raining, then I will not carry an umbrella.
2. If two perpendicular lines do not intersect, then they do not form four 90° angles.
3. If <EAD is 80°, then that means <DAB is 100°, because they equal 180°.
4. A pair of congruent angles are <EAC and <DAB

alekssr [168]3 years ago

8 0

1. c If it is not raining, then I will not carry an umbrella.

2.a Two intersecting lines are perpendicular if an only if they form four 90 degree angles.

3.a DAB and EAD are supplementary.

4.c FBY; GBX

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A force of 12 lb is required to hold a spring stretched 8 in. beyond its natural length. How much work W is done in stretching i

sattari [20]

Answer:

Work done in stretching the spring = 7.56 lb-ft.

Step-by-step explanation:

Normal length of the spring = 8 in or $\frac{8}{12}$ ft

= $\frac{2}{3}$ ft

If the spring has been stretched to 11 inch then the stretched length of the spring is = 11 in

= $\frac{11}{12}$ ft

Force applied to stretch the spring = 12 lb

By Hook's law,

F = kx [where k is the spring constant and x = length by which the spring is stretched]

12 = k( $\frac{2}{3}$ )

k = 18

Work done (W) to stretch the spring by $\frac{11}{12}$ ft will be

W = $\int\limits^\frac{11}{12} _0 {kx} \, dx$

= $\int\limits^\frac{11}{12} _0 {(18x)} \, dx$

= $18[\frac{x^{2}}{2}]^{\frac{11}{12}}_0$

= 9( $\frac{11}{12}$ )²

= 7.56 lb-ft

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3 years ago

NEED HELP ASAP

BlackZzzverrR [31]

1. 3375
2. 45
3. 14348907
4. 3375

but the 3 or 2 ???

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2 years ago

Which of the following statements is not true?

I am Lyosha [343]

I think B isn’t true

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3 years ago

When looking at the median of a data set, what information do you get when looking at the median?

cestrela7 [59]

You get the middle of all the data while looking at the median of a data set!

I hope this helped! Mark me Brainliest! :) -Raven❤️

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3 years ago

Malachy rolls a fair dice 168 times.

baherus [9]

Answer:

28 times

Step-by-step explanation:

On a fair die, the probability of rolling a 6, the only number greater than 5, is 1/6. So in 168 rolls of this die, Malachy can expect a 6 on 1/6 × 168, or 28 times.

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2 years ago