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yan [13]
2 years ago
12

9y²+21-18=0pls tell how to do​

Mathematics
1 answer:
alex41 [277]2 years ago
4 0

Hello,

I think it is 9y² + 21y - 18 = 0

we have a = 9 ; b = 21 and c = -18

∆ = b² - 4ac = 21² - 4 × 9 × (-18) = 1089 > 0

x1 = (-b - √∆)/2a = (-21 - 33)/9 = 6

x2 = (-b + √∆)/2a = (-21 + 33)/9 = 12/9 = 4/3

S = {4/3 ; 6}

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Can someone explain
IrinaVladis [17]

Answer:

See below ~

Step-by-step explanation:

Applying the rule (x - 5, y - 3) to the coordinates :

The coordinates are :

  • (2 - 5, -3 - 3) = (-3, -6)
  • (2 - 5, 2 - 3) = (-3, -1)
  • (5 - 5, -3 - 3) = (0, -6)
  • (5 - 5, 2 - 3) = (0, -1)

As evidenced by the rule :

The rectangle is translated <u>5</u> units to the left and <u>3</u> units down.

6 0
3 years ago
Evaluate the expression.<br><br> - 4(2 - 5)2 + 82
Pavlova-9 [17]

Answer:

106

Step-by-step explanation:

Ok this question is a bit confusing but once you understand the concept you will be able to answer the question correctly

Always know that bracket is solved first once it is found in the question

So back to the question

-4(2-5)2+82

So let's get to work...

Bracket first

-4(-3)2+82

Multiply with the number at the front then followed by the one at the back

(+12)2+82

24+82

106

Therefore the final answer is 106

I believe you understand how we get the answer...just be careful when solving this kind of question... simple

7 0
3 years ago
What is the 100th term in the sequence 23, 21, 19, 17, 15 ....?<br> PLEASE HELP
Volgvan

Hey there!

We can see we are subtracting 2 every time, and we have 95 terms left fo figure out, so we multiply 95 by 2 and get 190, then subtract that from 15.

15 - 190 = -175, therefore, that's the the 100th term.

Have a terrifcly amazing day!

3 0
3 years ago
Read 2 more answers
The area of a rectangular garden in square feet can be represented by 22 - 102 +21. The length is 2 - 7 feet. You have been hire
Anettt [7]

The area of a rectangular garden in square feet can be represented by z² - 10z +21. The length is z - 7 feet. You have been hired to fertilize the

garden. Recall that the area of the garden is z² - 10z +21. If z = 20 and the fertilizer costs $0.27 per square foot, how much it cost to fertilize

the garden?

Answer:

$ 59.67

Step-by-step explanation:

The area of a rectangular garden in square feet can be represented by z² - 10z +21 square feet

If z = 20

Therefore:

The area of the rectangular garden is:

20² - 10 × 20 + 21

400 - 200 + 21

= 221 square feet

The fertilizer costs $0.27 per square foot, how much it cost to fertilize

the garden?

The cost of fertilize the garden is calculated as:

1 square feet = $0.27

221 square feet = x

Cross Multiply

221 square feet × $0.27

=$ 59.67

4 0
3 years ago
The moon has a radius of about 939 leagues long. What is the total surface area of the moon? Rounded to the nearest whole number
muminat

Radius, r = 939 ft

Then:

Diameter, d = 1878 ft

Circumference, C = 5899.9110034416 ft

Area, A = 2770008.2161158 ft^2

AREA = 2770 if you're shortening.

6 0
3 years ago
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