Let the first number be A. and the second number B.
A + B=12-------equation1 and
A ×B =-64------eqn2

from eqn1,
A =12 - B
so put A=12-B into eqn 2

(12-B) ×B=-64
.12B-B^2=-64
B^2-12B-64=0
now use calculator to find the answer.
u will get two answers, but u haven't finished yet. if B is = X,
put Xinto A=12-B
to find the value of A.
and so the same for the second number.

3 0

4 years ago

What's the answer 2(×+4)=18

Nadusha1986 [10]

2(x+4)=18

2•x + 2•4 = 18

2x + 8 = 18

2x + 8 = 18
- 8 -8
_________
2x = 10

2x = 10
__ __
÷2 ÷2

x = 5

5 0

3 years ago

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In a flight of 600 km, the speed of the aircraft was slowed down due to bad weather. The average speed of the trip was decreased

UkoKoshka [18]

The average speed would be 600 km/hr.

Step-by-step explanation:

Let the original speed be 'x'

Let the decreased speed be 'x-200'

Distance = 600 km

Time increased by 30 minutes

According to question, it becomes,

$\dfrac{600}{x-200}-\dfrac{600}{x}=\dfrac{30}{60}\\\\\dfrac{x-(x-200)}{x^2-200x}=\dfrac{1}{2\times 600}\\\\\dfrac{200}{x^2-200x}=\dfrac{1}{1200}\\\\240000=x^2-200x\\\\x^2-200x-240000=0\\\\x=600,-400$

So, The average speed would be 600 km/hr.

5 0

3 years ago

Choose the correct sign that compares the decimal numbers. 0.737__0.708

allochka39001 [22]

Answer:

Step-by-step explanation:

0.737 is greater than 0.708

4 0

3 years ago

Read 2 more answers