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g100num [7]
3 years ago
10

I need help this is needed by tomorrow morning :)

Mathematics
2 answers:
TiliK225 [7]3 years ago
8 0
The answer is 1/50 cm
zhuklara [117]3 years ago
4 0
I think it’s 1/48 :)
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Solve the system of equations. -10y+9x=-9 <br> 10y+5x=-5
alexira [117]

by the use of elimination method

make all coefficients of subject to be eliminated similar..by multiplying the coefficients with one another

for eqn(i)

5(-10y+9x=-9)

-50y+45x=-45

for eqn(ii)

9(10y+5x=-5)

90y+45x=-45

-50y+45x=-45

90y+45x=-45

...subtract each set from the other...

we get

-140y+0=0

y=0

from eqn(i)

10y+5x=-5

0+5x=-5

x= -1

3 0
3 years ago
Consider the proof. Given: In △ABC, BD ⊥ AC Prove: the formula for the law of cosines, a2 = b2 + c2 – 2bccos(A) Statement Reason
loris [4]

Solution: The missing reason in Step 8 is substitution of x=c\cos (A).

Explanation:

The given steps are used to prove the formula for law of cosines.

From step 5 it is noticed that our equation is

a^2=b^2-2bx+c^2      ..... (1)

From step 7 it is noticed that the value of x is c\cos (A).

So by substituting c\cos (A) for x in equation (1) we get the equation of step 8, i.e.,

a^2=b^2-2bc\cos (A)+c^2

Hence, the missing reason in Step 8 is substitution of x=c\cos (A).



5 0
3 years ago
Read 2 more answers
5.Solve the system using substitution.
Nikolay [14]
OK first convert one of the equations into Y=MX+b form

Y-2x = 3
Add 2X

Y = 2x +3
Now substitute this equation in the other one.
So it would be

3X - 2Y = 5

3X-2(2x+3) = 5

Now solve for y

3X - 4X - 6 = 5

-1X - 6 = 5

Add 6

-1X = 11

X = -11

Now substitute this into one of the equations

Y - 2X = 3

Y -2(-11) = 3

Y +22 = 3

y = 3-22

y = -19


8 0
3 years ago
Simplify.<br> (w5)<br> I need this ASAP please
Ilya [14]
I’m pretty sure it’s w^25
5 0
3 years ago
.........help.......me.......please
jeyben [28]

Answer:

33

Step-by-step explanation:

since the whole thing is a right angle=90 you just subtract it from 57 and that's 33

6 0
3 years ago
Read 2 more answers
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