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Kamila [148]
3 years ago
13

Translate the sentence to an algebraic expression r minus 7

Mathematics
1 answer:
yanalaym [24]3 years ago
5 0

Answer:

r-7

Step-by-step explanation:

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How many solutions are there for the system x^2+4y^2=100 and 4y-x^2=-20
never [62]
There are 5 solutions for this system.

x^2 + 4y^2 = 100  ____1
4y - x^2 = -20  ____2
Add both 1 & 2 together. x^2 gets cancelled
4y^2 + 4y = 80   (send 80 to the other side and divide by 4)
Then equation the becomes : y^2 + y -20 =0
Now factorise the equation: (y+5) (y-4) = 0
Solve for y :  y = -5 and y = 4
Using the values of y to find the values of x. From equation 1:
x^2 = 100 - 4y^2    x = /100 - 4y^2  (/ means square root) Replace values of y
y = -5, x = /100 - 4(-5)^2 = /100 - 100 = 0
y = 4, x = /100 - 4(4)^2 = / 100 - 64 = /36 = -6 or 6
Thus we have 6 solutions y = -5, 4 and x = -6, 0, 6
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3 years ago
A type of cell triples every hour. If there are 5 cells initially, which function can be used to
laila [671]

Answer:

T(t) = 5(3)(t)

Step-by-step explanation:

There are 5 cells initially.

And it triple every hour.

So

T0 =5

T(t) = T0(3t)

Each cell has it's multipling factor because it's Will be multipling by 3 every hour

T(t) = 5(3)(t)

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3 years ago
Convert 2000 centimeters to inches
Free_Kalibri [48]

Answer:

787.4016 inches

Step-by-step explanation:

6 0
2 years ago
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After flying kites, mariana and reena go with their friends to the local ice cream shop. ice cream sundaes cost 2$ and banana sp
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I believe it is $40 in all.
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What is 6 power 100=?​
Gwar [14]

Answer:

6.533186235000709e+77

Step-by-step explanation:

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2 years ago
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