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vovangra [49]
3 years ago
5

(ab - 9)(ab + 8) Please answer.

Mathematics
1 answer:
WINSTONCH [101]3 years ago
3 0

\text{Use FOIL method:}\ (a+b)(c+d)=ac+ad+bc+bd\\\\(ab-9)(ab+8)=(ab)(ab)+(ab)(8)+(-9)(ab)+(-9)(8)\\\\=a^2b^2+8ab-9ab-72\\\\=\boxed{a^2b^2-ab-72}

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A city bus collected $780 in fares on one day.
Brilliant_brown [7]

Answer:

450 people paid the discounted fare and 750 people paid the regular fare.

Step-by-step explanation:

let r be regular fares paid and d be discounted fares paid

Total fares = 0.8r + 0.4d = 780

Since 1200 people paid the fares,

r + d = 1200 = Total people

Rearrange this formula:

r = 1200 - d

Substitute r into Total Fares formula

Total fares = 0.8r + 0.4d

780 = 0.8(1200-d) + 0.4d

780 = 960 - 0.8d + 0.4d

780 = 960 - 0.4d

0.4d = 180

d = 450

Sub d=450 into Total people formula

r + d = 1200 = Total people

r + 450 = 1200

r = 1200-450

r = 750

450 people paid the discounted fare and 750 people paid the regular fare.

3 0
3 years ago
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Given f(x)=5x+4, solve for x when f (x) = -6
Bingel [31]
So x=-2 after ndjsbdbbegshwoehev

4 0
2 years ago
PLEASE HELP!! WILL MARK BRAINLIEST! NO ONE HAS BEEN ABLE TO HELP!
GREYUIT [131]

Answer:  A


Step-by-step explanation:

Let us first observe behavior in only quadrant 1 .

On x-axis one small box represent one year.

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If we see the 1 year on x-axis its corresponding value of dollar on y -axis is in mid of 4 dollars and 5 dollars.

Now if we see the 2nd year on x-axis its corresponding value of dollar on y-axis is at 6 dollars .

It concluded that after each year 0.5 dollars per pound increases.

We can see the same behavior throughout the straight line.


4 0
3 years ago
Sarah is making her own costume for her role in the school play. The costume requires 25/8 yards of material. Select the number
BARSIC [14]

Answer:

Step-by-step explanation:

25/8

8*3=24

25-24=1

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3 years ago
Which system type is a linear system with infinitely many solutions?
Maru [420]

Answer: C

Step by step explanation-

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3 years ago
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