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seraphim [82]
3 years ago
9

Sarah was thinking of a number. Sarah doubles it and gets an answer of 4.5. What was the original number?

Mathematics
2 answers:
Nutka1998 [239]3 years ago
7 0

Answer:

2.25

Step-by-step explanation:

Just half 4.5 and you should get 2.25 which is quite easy to be honest

vodka [1.7K]3 years ago
6 0

Answer:

2.25

Step-by-step explanation:

4/5/2=2/25

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Answer the picture below.
inysia [295]

Answer:

Step-by-step explanation:

function: all the points

note: x intercept is the domain, y intercept is the range

domain must paired with exact range

the domain can be more than 1, but range must be 1.

domain : 3, 5, 0 , -1, -3, -5

range: 1, 3, 4 , -3(there is 2 but we write it one) , -4

and done!

thank you!

4 0
2 years ago
The altitude of a triangle is 1cm shorter than the base. If the area of the triangle is 15cm2, calculate the altitude.
WITCHER [35]

Answer:

5 cm

Step-by-step explanation:

We khow that the altitude of this triangle is 1cm shorter than the base

  • Let H be our altitude and B our base and A the area of the triangle
  • A= (B*H)/2 ⇒ 15=(B*H)/2
  • H is 1cm shorter than B ⇒ B=H+1
  • H*(H+1)/2=15 ⇒ H*(H+1)=30⇒ H²+H=30⇒H²+H-30+0

that's a quadratic equation . Let's calculate the dicriminant .

Let Δ be the dicriminant

  • a=1
  • b=1
  • c= -30
  • Δ=b²-4*a*c = 1²-4*1*(-30)=1+4*30=121≥0
  • Δ≥0⇔ that we have two solutions x and y
  • x= (-1-\sqrt{121})/2= (-1-11)/2= -6
  • y= (-1+\sqrt{121})/2= 10/2 = 5

We have a negative value and a positive one

The altitude is a distance so it can't be negative

H= 5cm

6 0
3 years ago
If a varies directly as b and a=3 when b=12, what is the value of a when b=18?
Zepler [3.9K]

Answer:

a is proportional to b

a=kb

k is proportionality constant

k =a/b =3/12 =1/4

k=1/4 = a/b=a/18

1/4=a/18

a=18/4 =9/2 =4.5 answer

4 0
3 years ago
The value of the fraction 3c+2/4 one less than the value of the fraction 5c-1/3.
melamori03 [73]

C.i need help...

sana masagutan nio po yan...

5 0
2 years ago
What is the product of 91 x 6,000?
mrs_skeptik [129]

Answer:

<h2>5,46,000</h2>

hope that helps uhh!!

4 0
3 years ago
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