MATHEMATICS COLLEGE

Someone help me on this.

Answers

Answer 1

Answer:

Answer:

$-57-39i$

Step-by-step explanation:

So we have the expression:

$(7+2i)(-9-3i)$

FOIL:

$=7(-9)+7(-3i)+2i(-9)+2i(-3i)$

Simplify:

$=-63-21i-18i-6i^2$

Recall that i² is just -1. Thus:

$=-63-21i-18i-6(-1)$

Simplify:

$=-63-21i-18i+6$

Combine like terms:

$=(-63+6)+(-21i-18i)$

Add:

$=-57-39i$

And we're done!

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Brian and Jennifer are planning to get married at the end of the year. They read that certain diets are healthier for specific blood types and hope that they both have the same blood type. Unfortunately, neither Brian nor Jennifer can remember their blood type.Suppose a recent study shows that 29% of adults have blood type A, 35% of adults have blood type B, 24% of adults have blood type AB, and 12% of adults have blood type O. The tree diagram shows the possible outcomes for Brian and Jennifer along with their associated probabilities. What is the probability that Brian and Jennifer share the same blood type?
PLEASE HELP I WILL MARK BRAINLIEST
Which property was used to simplify the expression? 3c+9+4c=3c+4c+9distributive propertycommutative propertyassociative propertyinverse property
Rewrite with positive exponents a^-3 b^-5

NO LINKS OR ANSWERING WHAT YOU DON'T KNOW?1. Suppose y varies inversely with x, and y = 25 when x = 1/5. What is the value of y when x = 5?

a. 15
b. 5
c. 25
d. 1

2. Suppose y varies inversely with x, and y = a when x = a^2. What inverse variation equation related x and y?

a. y = a^2/x
b. y = a^3/x
c. y= a^3x
d. y = ax

3. Suppose y varies inversely with x, and y = 3 when x = 1/3. What is the inverse variation equation that relates x and y?

a. y = 1/x
b. y =x
c. y = 3x
d. y = 3/x

Answers

Answer:

1. D. 1

2. B. y=a³/x

3. A. y=1/x

Step-by-step explanation:

too long to give te explanations but they're there in the attachments

Solve the system using elimination.7x + 10y = 27
X-10y = -19
The solution is
(Simplify your answer. Type an ordered pair.)

Answers

The solution is (1,2)

Step-by-step explanation:

7x + 10y = 27

x - 10y = -19 +--------------------

8x = 8

Divide by 8 on both sides

x = 1

To find y substitute any of the equations to 1

7(1) + 10y = 27

7 + 10y = 27

Substract 7 from both sides

10y = 20

Divide by 10

y = 2

What is the value of 8x + 2x when x = 6?

Answers

The value of 8x + 2x when x = 6 is 60

What is an Equation?

Equations are mathematical statements with two algebraic expressions flanking the equals (=) sign on either side.

It demonstrates the equality of the relationship between the expressions printed on the left and right sides.

Coefficients, variables, operators, constants, terms, expressions, and the equal to sign are some of the components of an equation. The "=" sign and terms on both sides must always be present when writing an equation.

Given data ,

Let the equation be A = 8x + 2x

The value of x = 6

Substituting the value of x in the equation , we get

A = 8x + 2x

A = 8 ( 6 ) + 2 ( 6 )

A = 48 + 12

A = 60

Therefore , the value of A = 60

Hence , the value of 8x + 2x when x = 6 is 60

To learn more about equations click :

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8x + 2x

Plug the variable in.

8×6 + 2×6

48+12 = 60

Sarah opens a savings account that has a 2.75% annual interest rate,compounded monthly. She deposits $500 into the account. How much will
be in the account after 15 years?
$500.00
$754.94

$1255.27

$255.27