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3 years ago

13

Lisa tossed two fair coins at the same time. She repeated this trial 180 times. How many trials should Lisa expect to result in

both coins showing tails?

1 answer:

Neporo4naja [7]3 years ago

7 0

Answer:

47

Step-by-step explanation:

4-3=7 7x3= 54 54-13= 47

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Jim is hiking 4 1/2 mile trail.He has already hiked 2 5/8 miles.How much further does he have to hike?

musickatia [10]

Answer:

1 7/8

Step-by-step explanation:

2 5/8

+1 7/8= 4 1/2

7=3+4
5+3=8
2 5/8 + 3/8= 3
3 + 1= 4
4 + 4/8= 4 4/8
4 4/8 = 4 1/2

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3 years ago

Match each expression to its equivalent standard form.

Aleksandr [31]

Let's expand the products they are all in the form

$(a+b)(a-b)=a^2-b^2$

For the first one we have a=x and b=2i:

$(x+2i)(x-2i)=x^2-(2i)^2=x^2+4$

For the second one we have a=x-2 and b=2i:

$(x-2+2i)(x-2-2i)=(x-2)^2-(2i)^2 = x^2-4x+4+4=x^2-4x+8$

For the third one we have a=x+1 and b=i:

$(x+1+i)(x+1-i)=(x+1)^2-i^2=x^2+2x+1+1=x^2+2x+2$

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3 years ago

Please help me with this questions I need the answer

Anastaziya [24]

Answer:

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Step-by-step explanation:

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Plzz help!!!!<br><br> Which set of ordered pairs corresponds to the graph?

adelina 88 [10]

Answer:

Option 3rd is correct

Step-by-step explanation:

(1,-6),(2,-4),(2,-2),(4,-2),(6,0)

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zhannawk [14.2K]

Answer:

a<-7/2 or a>1

Step-by-step explanation:

2a+5<-2 or -4a-1<-5

2a<-2-5 -4a<-5+1

2a<-7. -4a<-4

2a/2<-7/2 -4a/-4<-4/-4

a<-7/2 a>1

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3 years ago

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