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garri49 [273]
3 years ago
7

4y = 9x - 21 y = x-4

Mathematics
2 answers:
Anastaziya [24]3 years ago
5 0

Answer:

x = 1

y = -3

Step-by-step explanation:

if y = x - 4

then reorganise the first equation

4 (x - 4) = 9x -21

4x - 16 = 9x - 21

5 = 5x

x = 1

jasenka [17]3 years ago
3 0

Answer:

Point form:

(1,-3)

Equation form:

x = 1 ,y = -3

Please let me know if this is incorrect.

Hope I helped though.

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Element X is a radioactive isotope such that its mass decreases by 59% every day. If an experiment starts out with 390 grams of
miss Akunina [59]

Answer:

The function that represents the mass of the sample after t days is A(t) = 390(0.41)^t.

The percentage rate of change per hour is of -2.46%.

Step-by-step explanation:

Exponential amount of decay:

The exponential amount of decay for an amount of a substance after t days is given by:

A(t) = A(0)(1-r)^t

In which A(0) is the initial amount, and r is the decay rate, as a decimal.

Element X is a radioactive isotope such that its mass decreases by 59% every day. The experiments starts out with 390 grams of Element X.

This means, respectively, that r = 0.59, A(0) = 390

So

A(t) = A(0)(1-r)^t

A(t) = 390(1-0.59)^t

A(t) = 390(0.41)^t

The function that represents the mass of the sample after t days is A(t) = 390(0.41)^t.

Hourly rate of change:

Decreases by 59% every day, which means that for 24 hours, the rate of change is of -59%. So

-59%/24 = -2.46%

The percentage rate of change per hour is of -2.46%.

5 0
3 years ago
Helppp pls very urgent​
Ludmilka [50]

Answer:

1. 22000 millimeters

2. 1.5 grams

3. 15 centigrams

4. 5300 milliliters

5. 0.025 decagrams

6. 0.0083 decimeters

7. 0.027 decaliters

8. 28.7 millimeters

9. 5.4 decigrams

10. 1000 milligrams

Step-by-step explanation:

6 0
3 years ago
Two friends share 7 cookies equally .How many cookies does each friend get
algol13

Answer:

they would get 3 1/2

Step-by-step explanation:

because if there's two friends and seven cookies one friend we get three and the other one will get three and they could split the other cookie in half so that each Friend can have three cookies and a half if they split

7 0
3 years ago
5
Dimas [21]

Answer:

0.150 < (Proportion of Sandy's pie) < 0.167

15% < (Percentage of Sandy's pie) < 16.7%

Step-by-step explanation:

Total percentage of pie = 100% or 1

George, Sandy, Carlos, and Michelle all ate a piece of the pie.

George ate a fraction of 0.150

Michelle ate a fraction of (1/6) = 0.167

Carlos ate a fraction of (1/7) = 0.143

The amount of pie left = 1 - 0.15 - (1/6) - (1/7) = 0.5405

And Sandy is known to eat more than two of her friends, but less than one of them.

Of the amount of pie eaten by the first 3 friends, (1/6) is the highest proportion.

Hence, it is evident that Sandy ate more than 0.143 and 0.150 (Carlos and George) but less than Michelle (0.167).

So, mathematically, the possible proportion of cake that Sandy ate is

0.150 < (Proportion of Sandy's pie) < 0.167

Hope this Helps!!!

7 0
3 years ago
Given line m is parallel to line n. What theorem or postulate justifies the statement? ∠1 ≅ ∠4
natima [27]

Answer:

corresponding angles postulate

Step-by-step explanation:

just took the test ;)

6 0
3 years ago
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