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Deffense [45]
2 years ago
12

Which expression is equivalent to 0? (a)(-a) a +(-a) a/-a a - (-a)

Mathematics
2 answers:
Sergeeva-Olga [200]2 years ago
8 0
A+(-a) equals zero because they cancel each other out .

(a)(-a) equals -a
a/-a equals -a
and
a-(-a) equals positive a
cupoosta [38]2 years ago
6 0

Answer:

a - a or (a +(-a))

Step-by-step explanation:

A negative plus a positive is always zero if they have the same variable.

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What are the roots of the equation 9x^2-42x+50=0 in simplest a+bi form?
Lapatulllka [165]

Answer:

-7/3 +\- 1/3i

Step-by-step explanation:

3 0
3 years ago
There are 3 red and 9 blue counters in a box. A counter is chosen and then replaced. If you did this 144 times, how many times w
anygoal [31]
If you do it 144 times that is (3+9)*12
This means that 12 times 3 red and 9 blue counters will be chosen that means that 9 blue counters will be chosen 12 times. 9*12 is 108.
This means blue counters will be chosen 108 times.
This can be checked as 108/3 would give you the number of red counters which is 36 and 108+36 is 144 

3 0
3 years ago
The number of board feet in a 16 foot long tree is approximated by the model F(d) = 0.77d^2 -- 1.32d -- 9.31 where F is the numb
Lubov Fominskaja [6]

we are given

F(d)=0.77d^2-1.32d-9.31

where

F is the number of board feet

d is the diameter (in inches) of the log

Since, we have to minimize F

so, firstly we will find it's derivative

F'(d)=0.77\times 2d-1.32\times 1-0

F'(d)=1.54d-1.32

now, we can set it to 0

and then we can solve for d

F'(d)=1.54d-1.32=0

1.54d-1.32=0

so, we get diameter as

d=\frac{6}{7}inch..............Answer

6 0
3 years ago
What location on the line would you find the constant of proportionality?
juin [17]

Answer:

2.4

Step-by-step explanation:

The constant of proportionality is y=kx which should 2.4

3 0
2 years ago
Solve for x and show work.
SVEN [57.7K]

Answer:

x = 2

Step-by-step explanation:

The four sides of a rhombus are equal.  Thus, 10x + 6 = 4x + 18.

Solve this equation for x:

6x = 12

So, finally, x = 2

8 0
2 years ago
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