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3 years ago

What is the result of isolating y2 in the equation below? 9x2 + 7y2 = 42

Mathematics

1 answer:

ElenaW [278]3 years ago

8 0

First, move 9x^2 to the right:

7y^2 = 42 - 9x^2

Then, divide 7 on both sides:

y^2 = 6 - 9/7 * x^2

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What is 6 in 16.5 rounded to

Delicious77 [7]

Answer:

The 6 in 16.5 will be rounded to 7.

So 16.5 would become 17.

Step-by-step explanation:

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2 years ago

Solution:

makkiz [27]

Answer:

You will have 1.585 left after 35 years.

Step-by-step explanation:

Equation for amount of a substance:

The equation for the amount of a substance, using exponential decay, 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.

The half-life of BRADIUM-29 is 15 years.

This means that $A(15) = 0.5A(0)$ . We use this to find r.

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

$0.5A(0) = A(0)(1 - r)^{15}$

$(1 - r)^{15} = 0.5$

$\sqrt[15]{(1 - r)^{15}} = \sqrt[15]{0.5}$

$1 - r = (0.5)^{\frac{1}{15}}$

$1 - r = 0.9548$

Then

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

$A(t) = A(0)(0.9548)^t$

You have 8 ounces of this strange substance today

This means that $A(0) = 8$ . So

$A(t) = A(0)(0.9548)^t$

$A(t) = 8(0.9548)^t$

How much will you have left after 35 years?

This is A(35). So

$A(t) = 8(0.9548)^t$

$A(35) = 8(0.9548)^{35} = 1.585$

You will have 1.585 left after 35 years.

8 0

3 years ago

A parabola has an x-intercept of -1, a y-intercept of -3, and a minimum of -4 at x = 1.

Svet_ta [14]

(x-1)^2-4

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3 years ago

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Step-by-step explanation:

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3 years ago

How to add the integers -7 and -5 plzzz help

padilas [110]

Answer:

oh its really easy

so for -7 you would just count up but negatives so -7 and -5= -13 :)

Step-by-step explanation:

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3 years ago

Read 2 more answers