MATHEMATICS MIDDLE SCHOOL

(9-7i)–(4i +15)
What’s the answer

Answers

Answer 1
Answer:

Answer:

-6 - 11i.

Step-by-step explanation:

(9-7i)–(4i +15)

= 9 - 7i - 4i - 15     Add like terms:

= -6 - 11i.

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Which conclusion of the following statement must always be true?“If angle 1 and angle 2 are alternate interior angles of parallel lines cut by a transversal, then”angle 1 and angle 2 are supplementary.angle 1 and angle 2 are complementary.angle 1 and angle 2 are a linear pair.angle 1 is congruent to angle 2.
Draw pictures showing two different ways to buy 276 markers

$450+4%=$???????????????

Answers

In order to solve this, we first need to convert the percentage into a decimal. We can do this by either multiplying the percentage by 100, or (my personal shortcut) just moving the decimal point over two places to the left.

4% = 0.04

Now, we need to multiply the decimal by the amount of money we have.

450 * 0.04 = 18

Now, we need to add this newfound amount to the total, since we are adding the 4%

450 + 18 = 468

$450 + 4% = $468
Hope that helped =)

A theater technician charges a $200 flat fee and 5% of all profits from ticket sales per show. If the technician made $400.00 on a show, how much total profit was there from ticket sales

Answers

The profit would be 5% of 400, or (5)/(100)*400=(400)/(20)=20, that is, $20 for profit! Not much, I suppose...

PLEASE SOMEONE HELP AND EXPLAIN THE FIRST ONE PLEASE SO THE HALF LIFE OF A RADIOACTIVE KIND OF POTASSIUM IS 12 HRS . HOW MUCH WILL BE LEFT AFTER 36 HRS, IF YOU START WITH 64 GRAMS OF IT? SO I DID A=64(1/2)^36 POWER IS THAT THE ACCURATE FORM PLEASE I NEED HELP ASAPBTW THIS IS EXPONENTIAL DECAY

Answers

Don't get carried away with the exponent.

The exponent is not the number of years or the number of hours.
The exponent is the number of half-lifes.

In this one, the half-life is 12 hours, and they want to know
how much is left after 36 hours.  36 hours is 3 half-lifes.
The formula that you did is beautiful and almost perfect.
Just change that ugly exponent to the number of half-lifes (3)
and the answer will jump out at you.
half life formula is
F=P(1/2)^(t/h)

F=furure or ending amount
P=present amount
t=time elapsed
h=time the half life is


F=64(1/2)^(36/12)
F=64(1/2)^(3)
F=64(1/8)
F=8 grams

Simplify using the Laws of Exponents.

(6a2b6)3

Answers

(6a²b⁶)³
(6a²b⁶)(6a²b⁶)(6a²b⁶)
(6 · 6 · 6)(a² · a² · a²)(b⁶ · b⁶ · b⁶)
216a⁶b¹⁸

Joelle bought 20 lollipops and 6 bags of Doritos for a total cost of $8.20. She knows that each lollipop cost 25 cents and reasoned that two bags of chip must cost a little more than $1.00. Is this a reasonable guess? Why or why not?

Answers

I mean... I think it's a reasonable guess because not gonna lie- chips can get expensive. BUT- It doesn't really make sense because like, she bought so many lollipops. My brain isn't really functioning to do the math- but my best guess would beeeee...UNreasonble. I'm super super sorry if it's wrong. Math isn't my strong point, sorry. Have a nice day!

Answer:

no

Step-by-step explanation:

because 20×.25 = 5 so the lollipop cost $5.00 and then you only have 3.20 left over

Circumference of a circle is 40 π cm. A quarter of the circle represents the developer layer genuine coupe. Calculate the surface compartment.

Answers

we have to find the radius, how can we got it??

C=2\pi*r

then

40\pi=2\pi*r

\boxed{r=20~cm}

A quarter of the circle will have a surface of a quarter of the circle, there fore

this is the surface of the circle

S=\pi*r^2

a quarter of it

S_{(1)/(4)}=(1)/(4)*\pi*r^2

then we can replace the value of r

S_{(1)/(4)}=(1)/(4)*\pi*20^2

S_{(1)/(4)}=(1)/(4)*\pi*400

we can simplify 

\boxed{\boxed{S_{(1)/(4)}=100\pi~cm^2}}
2 \pi r=40 \pi \ cm\ \ \ \Rightarrow\ \ \ r= (40 \pi )/(2 \pi ) =20\n\nS= \pi r^2\ \ \ \Rightarrow\ \ \ quarter:\ \ A= (1)/(4) \cdot S= (1)/(4) \cdot \pi \cdot20\cdot20=100 \pi \ [cm^2]
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