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Sloan [31]
2 years ago
15

I don't understand how to solve this

Mathematics
1 answer:
Trava [24]2 years ago
8 0
X^2+81=4x^2
3x^2=81
x^2=27
x=(27)^0.5
You might be interested in
WIll give brainliest Use the information given to answer the question.
MaRussiya [10]

Answer:

x²-12x+36

Step-by-step explanation:

an expression in the form (a-b)² is expanded to the form a²-2ab+b²

you can also expand it to (x-6)×(x-6) then multiply the first term by the first the outer term by the outer term the inner term by the inner term and the last term by the last term (foil)

the first terms are x and x = x² the outer terms are x and -6 = -6x the inner terms are also x and -6 = -6x

the last terms are 6 and 6 = 36

adding all the four products =

x²-12x+36

7 0
2 years ago
An owner of Honda City car sells his car at a price of RM 7.50,000 with a loss present of 12.5%. Then find the price at which he
Mars2501 [29]

Answer:

Cost = RM 857143

Loss = RM 107143

Step-by-step explanation:

<u>Given:</u>

  • Selling price SP = RM 750000
  • Loss% = 12.5
  • Cost price CP = x

<u>Cost price is found as:</u>

  • SP = CP - 12.5%
  • 750000 = x - 12.5%
  • 750000= x*(100-12.5)/100
  • 750000= 0.875x
  • x= 750000/0.875
  • x≈ RM 857143

<u>Loss is:</u>

  • RM 857143 - 750000 = RM 107143

8 0
3 years ago
(a) Complete the table of values for y- 2x + 5<br> -<br> 0<br> 1<br> 2<br> 1<br> 5<br> Y
maxonik [38]

Answer:

Step-by-step explanation:

I think you meant y = -2x + 5.

x    y = -2x + 5

0                       5

1      -2(1) + 5 =   3

2     -2(2) + 5 =   1

Note that every time you increase x by 1, y decreases by 2.

5 0
2 years ago
Plsss help!!!!!!! #3 #4​
AVprozaik [17]

Answer:

3) 162 ft²   ||  4) 38.25 mm²

Step-by-step explanation:

3)

area of triangle = 0.5 * base * height

                          = 0.5 * 27 *  12

                          = 162 ft²

4) area of triangle = 0.5 * base * height

                              = 0.5 * 8.5 * 9

                              =  38.25 mm²

3 0
2 years ago
Read 2 more answers
Question Help
lorasvet [3.4K]

Answer:

The speed of the boat is 20 km/hr

Step-by-step explanation:

Let s be the speed of boat in still water

Let d be the distance

Upstream speed = s-4

Jane took 30 min to drive her boat upstream to water-ski at her favorite spot.

So, Distance traveled in upstream =Speed \times time =(s-4) \times \frac{30}{60}

Downstream speed = s+4

So, Distance traveled in downstream = Speed \times time =(s+4) \times \frac{20}{60}

So, (s-4) \times \frac{30}{60}=(s+4) \times \frac{20}{60}

30s-120=20s+80

10s=200

s=20

Hence The speed of the boat is 20 km/hr

6 0
2 years ago
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