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ololo11 [35]
3 years ago
15

Solve the equation x2+11x-15=0, give ans to two dp.

Mathematics
1 answer:
Charra [1.4K]3 years ago
8 0
Im going to assume you know the formula.
sooo.
x= -11 +- √ (11)² -4 (1) (-15)
     --------------------------------- 
          2(1)

= -11 +- √121- (-60)
  -------------------------
              2

= -11 +- √181
   -----------------
            2

= -11 +- 13.45
   -----------------
             2

Either:                                                Or:
                                                          X = -11 - 13.45
  x = -11 + 13.45                                       ---------------
                                                                        2
       ----- ----------                               
              2       
   x = 1.23                                           x= -12.23
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frez [133]

Answer:

Q1: 28 : 3

Q2: 36 : 3

Step-by-step explanation:

Q1 EXPLANATION:

theirs 7 days in a week and theirs four weeks

4 x 7 = 28, theirs 3 days

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Q2 EXPLANATION:

Theirs 12 in a dozen and theirs 3 dozens

3 x 12 = 36, theirs 3 eggs

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Q3 EXPLANATION:

8 litres is 144 km

divide both by 4

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then times both by 3

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4 0
3 years ago
Angela opened a new bakery. She got orders for 2 cakes the first week, 4 cakes the second week, and 8 cakes the third week. If t
Inga [223]

Answer:

16

Step-by-step explanation:

The first week she got 2 cakes

The second week she got 4 cakes

The third week she got 8 cakes


The formula is x*2


2*2 = 4

4*2 = 8

8*2 = 16

5 0
3 years ago
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Kitty [74]

Answer:

10

Step-by-step explanation:

8 0
3 years ago
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Daine simplified the expression below.
Luda [366]

Answer:

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5 0
3 years ago
The value of a professional basketball player's autograph rose 20% in the last year. It is now worth $324.00. What was it worth
Helga [31]

So what you want to find is: what number times 120% is $324.00. (IT is 120% percent because it is the original <em>plus</em> the new percent) Simply set it up like so:

SN *120% = $324.00

Now turn the percent into a decimal:

SN * 1.20 = $324.00

Now divide $324.00 by 1.20

SN = $270

The original value of the basketball player's autograph was 270 dollars!

Hope that helps!




4 0
3 years ago
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