Simplify the expression: (7 +9i)(8 - 10i)

56 + 2i + 90
56 + 2i – 90i^2
97 + 72i
146 + 2i

Answers

Answer 1

Answer:

The answer is 146+2i

ur welcome

Related Questions

Louisa is 152.7 centimeters tall. Her younger sister is 8.42 centimeters shorter than she is. How tall is Louisa's younger sister?
Find the volume of this box of cookies with a length of 9 inches, width of 7 inches and height of 10.6 inches.26.6 inches cubed169.6 inches cubed667.8 inches cubed706.8 inches cubed
What is 50 divided by 2.5
how do you use equations to solve problems about area of rectangles parallelograms trapezoids and triangles
How to spell 20,484,163 in word form

3x and -2x are they like terms or unlike terms

Answers

Answer:

Yes they are like terms.

Step-by-step explanation:

As like terms are those who has same variables or powers.Here,we have same variables for both the terms and both have the power 1.

hope it helps!

They are like terms

What is .03 as a percent and degree?

Answers

.03 as a percent is 3%...... because you move the decimal to the left two times.

NOt sure about the degree but to figure out the percent you move the decimal over 2 spaces so the answer would be 30%

Expand the expression and combine like terms:
−r+8(−5r−2)

Answers

$-r+8(-5r-2) \n \n 8(-5r - 2) - r \n \n -40r - 16 - r \n \n (-40r - r) - 16 \n \n -41r - 16 \n \n$

The final result is: -41r - 16.

1) Shane works at a computer store. If he earns $20.93 from a 7% commission on the sale of a printer, what is the price of the printer?2) Kayla earns a weekly salary of $290 plus a 5.5% commission on sales at a gift shop. How
much would she make in a week if she sold $5700 worth of merchandise?

3) Heather works in a clothes shop, where she earns a commission of 5% and no weekly salary. What will Heather's weekly sales have to be for her to earn $375 in one week?

4) The sales tax rate in Brad's town is 4.25%. If he buys 3 lamps for $22.49 each and a sofa for $829.99, how much sales tax does he owe?

Answers

1. he earns 20.93 which is 7% of the price of the printer so 7%=7/100 so
20.93=7/100 so here is a little trick
so we want to know what 100% is so
we know that 1/2 is equal to 4/8 so since they are equal, we can flip one of them and if we multiply them with each other, we will get 1/1 or 1 so 1/2 times 8/4=8/8 or 1 so

20.93/x (x=100%)
20.93/x=7/100 so
20.93/x times 100/7=1
2093/7x=1
multiply both sides by 7x
2093=7x
divide both sides by 7
299=x
the printer cost $299

2.so 290+5.5% of sales
sales=5700
5.5%=0.055
'of' can be thought of as multiply so
0.055 times 5700=313.5
290+313.5=603.5=what she made that week

3. she earns 5% and that's all she earns
5%=375
a hack is that 5 times 200=100 so
5% times 20=100% so
375 times 20=100%=$7500=amount that needs to be sell to get 375

4. so he buys 3 laps at 22.49 each and 829.99 with 4.25% or
3 times 22.49=67.47+829.99 times 4.25% or
897.46 times 4.25% or 897.46 times .0425 and get $38.1421 sales tax owed

1. 20.93 is 7% of something. Divide 20.93 by 7 and you get 2.99, which is 1% of something Multiply 2.99 by 100 to get the original value, $299

2. 5.5% of 5700 is 313.5. Add that to 290 to get $603.5

3. The $375 that she earns is 5% of what she has sold. Multiply 375 by 20 to get $7500, how much she needs to sell

4. The total cost of the 3 lamps is 22.49x3, 67.47. Add that to 829.99 to get 897.46. Multiply that by 0.0425 (4.25%) to get 38.14205, or just 38.14 in sales tax

What is the unknown number and sequence 2 in the chart