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3 years ago

Simplify the expression to a+bi form: (-6-10i)(2-3i)

Mathematics

2 answers:

Fantom [35]3 years ago

7 0

Answer:

-42-2i

Step-by-step explanation:

MA_775_DIABLO [31]3 years ago

4 0

So the answer is -42-2i

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if postage costs $0.54 for the first once and $0.22 for each additional ounce, calculate the cost of mailing a 10-once envelope

Dvinal [7]

You would just multiply $0.22 8 times then add the $0.54 to it and you get $2.30

8 0

4 years ago

Read 2 more answers

Help and please explain

katrin2010 [14]

alright so you need to find the unit rate for both of these bought items.

5.25(5 1/4) pounds is equal to $2.10 if you set it into an equation

5.25x = $2.10

x represents how much is the price for one pound of banana

to find x you divide $2.10 by 5.25

you can either plug that into a calculator (.4 is the answer)

to divide a fraction

2.10 / 1 ÷ 21/4

switch the 21/4

2.10/1 ÷ 4/21

instead of using division to solve this you actually multiply!(don't ask me why)

2.10 × 4 = 8.4

21 × 1 = 21

now divide 8.4 by 21 = $0.4 for each pound of bananas

do the same on the other persons payment

3.25x = 6.5

x = 0.5

now you answer it. which one is cheaper?

7 0

4 years ago

Find the MIDPOINT between (-12, – 7) and (-8,-4).

DanielleElmas [232]

so you take the average of the x coordinates and the average of the y coordinates to get the midpoint like this

7 0

3 years ago

Rectangle ABCD is shown with diagonal AC drawn. Point F is on AC and point E on DC such that FE is perpendicular to DC. Prove tr

777dan777 [17]

Triangle ABC is similar to triangle CEF.

Explanation:

Diagram is inserted for the reference.

ABCD is a rectangle.

ABC is a right angled triangle because all the angles of the rectangle are 90◦ - (a)

CEF is a right angled triangle because FE is perpendicular to DC – (b)

In triangles ABC and CEF,

1. Angle ABC = Angle CEF = 90◦ (Both are right angles from a and b)

2. Angle BCA = Angle EFC (Alternate angles on parallel lines are equal on intersection)

Hence using Similarity property of AA (Angle, Angle), Triangle ABC and CEF are similar.

5 0

3 years ago

Tony’s club is selling oranges to raise money. For every box they sell, they get 1 1/8 dollars profit. They have sold 75 boxes a

Luden [163]

$1\frac{1}{8} = \frac{9}{8} = 1.125, 
 \\ 75*1.125= 84.375$

84.375 is the profit ALREADY made, so now subtract that from 180 dollars to get
95.625 $ needed, now divide by amount of profit per box...

Answer should be 85 boxes

4 0

3 years ago