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Natali [406]
3 years ago
15

In a diagram shown,

Mathematics
1 answer:
GREYUIT [131]3 years ago
5 0
Area of XYRY
=84-21
=63

a*9=63

/9. /9

a=7

b*7=21

/7. /7

b=3
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Lostsunrise [7]

Answer:A

Step-by-step explanation:

8 0
3 years ago
The half-life of a certain radioactive material is 78 hours. An initial amount of the material has a mass of 790 kg.. Write an e
adoni [48]
<span> half life i= 78 hours 
 amount after 78 hours is 395 kg: 
395 = 790e^(k*78) 

Dividing by 790 and taking natural log
ln (395/790) = (k*78) 
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lets calculate  how much is left after 18 hours: 
Amount(18)
= 790e^(-0.00888*18) 
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hope this helps</span>
4 0
3 years ago
Read 2 more answers
7 - 5n = 6 + 6(n + 2)
postnew [5]
7- 5n=6+6(n+2)
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4 0
3 years ago
PLEASE HELP ME NOW URGENT
timama [110]

ANSWER

y   = 3 \pm \sqrt{21}

EXPLANATION

The quadratic equation is:

{y}^{2}  - 6y - 12 = 0

Group variable terms:

{y}^{2}  - 6y = 12

Add the square of half, the coefficient of y to both sides.

{y}^{2}  - 6y  + ( - 3) ^{2} = 12 + ( - 3) ^{2}

{y}^{2}  - 6y  + 9= 12 + 9

The LHS us now a perfect square trinomial:

{(y - 3)}^{2}= 21

Take square root:

y - 3 =  \pm \sqrt{21}

y = 3 \pm \sqrt{21}

The first choice is correct.

8 0
3 years ago
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tia_tia [17]

Answer:

1

Step-by-step explanation:

2/7+5/7=7/7=1 because 7/7 would be a 1 whole

4 0
3 years ago
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