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Varvara68 [4.7K]
2 years ago
12

-2x -3=9 solve and explain

Mathematics
1 answer:
soldier1979 [14.2K]2 years ago
8 0

Answer:

-6

Step-by-step explanation:

-2x - 3 = 9

     + 3     +3

-2x = 12

/ -2     / -2

x = -6

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6 0
3 years ago
Suppose 2 eggs with bacon cost 2.70 . One egg with bacon costs 1.80 . At thesebrates what will bacon alone cost
Leno4ka [110]

If 2 eggs with bacon cost 2.70, and 1 egg with bacon costs 1.80, that means that 1 egg costs 0.90, so when we subtract once more 0.90 we get the price of the bacon alone, which is in this case 0.90.

5 0
2 years ago
A lighthouse is built on an exposed reef, 4.5 miles off-shore. The shoreline is perfectly straight, and a town is located 6 mile
Alisiya [41]

Answer: 3.94 hours

Step-by-step explanation:

From the question, the following parameters are given:

Distance offshore = 4.5 miles

Distance downshore = 6 miles

Speed when running = 3.4 mph

Speed with boat = 1.8 mph

distance of boat rowing = sqrt(4.5^2 + x^2)

Where

Speed = distance/time

Time = distance/speed

Time = distance of boat rowing/1.8

distance of running = 6 - x

Time = (6-x)/3.4

total travel time

t = sqrt(4.5^2 + x^2)/1.8 + (6 - x)/3.4

dt/dx = x/(1.8×sqrt(4.5^2 + x^2) - 1/3.4

d^2t/dx^2 = +ve at any x

x is at its minimum when dt/dx=0

x/(1.8×sqrt(4.5^2 + x^2) = 1/3.4

x = 6/sqrt(253) × 4.5 = 1.697 miles

Substitute x in

t = sqrt(4.5^2 + x^2)/1.8 + (6 - x)/3.4

We obtaine

t = sqrt(4.5^2 + 1.697^2)/1.8 + (6 - 1.69)/3.4

t = 2.672+ 1.266 = 3.94 hours

7 0
2 years ago
If x+y=10 and x-y=4,find the value of x*x-y*y
Irina18 [472]
Hi,
x^2-y^2=(x+y)*(x-y)=10*4=40
6 0
3 years ago
I NEED HELP ASAP!!<br><br> 4(5)(-2)=?
vova2212 [387]
So, in an easier way to say it
4 × 5 × -2

You would start by doing 
4 × 5 = 20
Then,
 20 × -2 = 40 

So your answer is -40

Hope I helped ♥
5 0
3 years ago
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