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3 years ago

Solve the formula for the indicated variable. A = 4πr² for r when r > 0 r =

Mathematics

2 answers:

SashulF [63]3 years ago

8 0

Answer:

√(A/4π) = r

Step-by-step explanation:

A = 4πr²

r² = A/4π

r = √(A/4π)

77julia77 [94]3 years ago

4 0

Answer:

r = $\sqrt{\frac{A}{4\pi } }$

Step-by-step explanation:

Given

A = 4πr² ( isolate r² by dividing both sides by 4π )

r² = $\frac{A}{4\pi }$

Take the square root of both sides

r = $\sqrt{\frac{A}{4\pi } }$

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A bag contains only cherry and grape gumballs. The ratio of cherry gumballs to grape gumballs in the bag is 7:6. What is the rat

Ede4ka [16]

So,

There are 7 cherry gumballs and 6 grape gumballs.

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7 0

4 years ago

What is 'a)' on question 4?

Nikolay [14]

A = 4b

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3 0

3 years ago

Number 1 and 2 please (25 points)

Elenna [48]

Answers:

1) $(3x+2)+(4-5x)=-2x+6$

$(3+2i)+(4-5i)=7-3i$

2) $(1-3x)(2+x)=-3x^{2}-5x+2$

$(1-3i)+(2+i)=5-5i$

Step-by-step explanation:

In mathematics there are rules related to complex numbers, specifically in the case of addition and multiplication:

<u>Addition: </u>

If we have two complex numbers written in their binomial form, the sum of both will be a complex number whose real part is the sum of the real parts and whose imaginary part is the sum of the imaginary parts (similarly as the sum of two binomials).

For example, the addition of these two binomials is:

$(3x+2)+(4-5x)=3x-5x+2+4=-2x+6$

Similarly, the addition of two complex numbers is:

$(3+2i)+(4-5i)=3+4+2i-5i=7-3i$ Here the complex part is the number with the $i$

<u>Multiplication: </u>

If we have two complex numbers written in their binomial form, the multiplication of both will be the same as the multiplication (product) of two binomials, taking into account that $i^{2}=-1$ .