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Semmy [17]
3 years ago
11

If i = V-1, then (3 – i)(3+ i) =

Mathematics
1 answer:
castortr0y [4]3 years ago
4 0
9-i^2
9-v^+2v-1
-v^2 +2v +8
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Tu went to the movies. he bought 2 tickets for $ 9.50 each, popcorn for $ 5.00, and 2 drinks for $ 4.25 each. He give the clerk
alexandr1967 [171]

Answer:

Option A -  $ 40.00 - $9.50 - $4.25 - $5.00                          

Step-by-step explanation:

Given : Tu went to the movies. he bought 2 tickets for $ 9.50 each, popcorn for $ 5.00, and 2 drinks for $ 4.25 each. He give the clerk two $ 20.00 bills.

To find : Which expression can not be used to find the amount of changes Tu got?

Solution :

He give the clerk two $ 20.00 bills i.e. 2\times 20 or 40

He bought 2 tickets for $ 9.50 each i.e. -(2\times 9.50) or -9.50-9.50

Popcorn for $ 5.00 i.e. -5

2 drinks for $ 4.25 each i.e. -(2\times 4.25) or -4.35-4.25

The expression can not be used to find the amount of changes Tu got is

' $ 40.00 - $9.50 - $4.25 - $5.00'.

Therefore, option A is correct.

3 0
3 years ago
Before beginning voice lessons, Chad already knew how to sing 805 pieces, and he expects
NeTakaya

Let's create an equation to find the # of weeks until Chad learns 937 pieces.

x = # of weeks

937 = 2x + 805

Subtract 805 from both sides.

132 = 2x

Divide both sides by 2

66 = x

Chad will need 66 weeks of lessons to learn 937 pieces.

4 0
3 years ago
How do you solve for s? s + 1/4= 12 1/2
andrezito [222]
Minus 1/4 on both sides to get s= 12 1/4

Hope I'm the brainliest for this question!
6 0
3 years ago
Read 2 more answers
In ΔJKL, the measure of ∠L=90°, JK = 99 feet, and KL = 58 feet. Find the measure of ∠J to the nearest degree.
vovangra [49]

Answer:

<h3>Step-by-step explanation: </h3>

find the measure of <K. then add the measure of <K to <L. then subtract the sum of those two angle measures from 180, then that's the measure of <J

6 0
3 years ago
Read 2 more answers
The table shows the number of people per day who died from SARS in Singapore at two-week intervals beginning on March 1, 2003.
julia-pushkina [17]

Answer:

Step-by-step explanation:

check attachment for chart

(a) When a data set is given, the area can be calculated using either left Riemann sum (when we use left end points of each interval) or right Riemann sum (when we use right end points of each interval).

Here the intervals are:

|----------------Interval---------------||----left point--||--right point---|

March 1 - March 15 (t0 to t1) : y0 = 0.0079, y1 = 0.0638

March 15 - March 29 (t1 to t2) : y1 = 0.0638, y2 = 0.1944

March 29 - April 12 (t2 to t3) : y2 = 0.1944, y3 = 0.4435

April 12 - April 26 (t3 to t4) : y3 = 0.4435, y4 = 0.5620

April 26 - May 10 (t4 to t5) : y4 = 0.5620, y5 = 0.4630

May 10 - May 24 (t5 to t6) : y5 = 0.4630, y6 = 0.2897

Hence total no. of deaths using left end point:

= y0.\bigtriangleup t + y1.\bigtriangleup t + y2.\bigtriangleup t + y3.\bigtriangleup t + y4.\bigtriangleup t + y5.\bigtriangleup t (\bigtriangleup t = 14 days)&#10;\\\\=(y0 + y1 + y2+ y3 + y4 +y5).\bigtriangleup t&#10;\\\\=(0.0079 + 0.0638 + 0.1944 + 0.4435 + 0.5620 + 0.4630) (14) = 24.2844 \approx 25 deaths (taking next integer value)&#10;

And total no. of deaths using right end point:

= y1.\bigtriangleup t + y2.\bigtriangleup t + y3.\bigtriangleup t + y4.\bigtriangleup t + y5.\bigtriangleup t + y6.\bigtriangleup t (\bigtriangleup t = 14 days)&#10;\\\\=(y1 + y2+ y3 + y4 + y5 + y6).\bigtriangleup t&#10;\\\\=(0.0638 + 0.1944 + 0.4435 + 0.5620 + 0.4630 + 0.2897) (14) = 28.2296 \approx 29 deaths (taking next integer value)

b)  If we are given derivative of a function f(t) as a function of time, that is:

\frac{\mathrm{d} }{\mathrm{d} t} (f(t)) = f'(t)&#10;

then the function can be evaluated by integrating both the sides. That is:

f(t) = \int f'(t) dt&#10;

And by definition we know that integration of a curve gives area under the curve. Hence if we have data for SARS deaths per day (i.e. derivative of total deaths as a function of time) then, if this data is plotted on a curve, area under this curve will give us total no. of deaths during a time period.

8 0
3 years ago
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