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Aleks04 [339]
3 years ago
10

The expression 3 (x minus 9) is equivalent to

Mathematics
2 answers:
miskamm [114]3 years ago
8 0

Answer:3(x-9) is expressed as 3x-27

Step-by-step explanation: 3(Xminus9)

3(X-9)

Use 3 to open the bracket by using 3 to multiply everything in the bracket.

Then you will get

3x-27

cupoosta [38]3 years ago
3 0

Answer:

d

Step-by-step explanation:

i just took the test

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3 years ago
Find the two-digit number which is 2 times the sum of its digits. Find a statement and number, please.
poizon [28]
A two-digit number is twice the sum of its digit. If the tens digit is 7 less than the unit digit, find the number. 
Let x= the unit digit
Then y= the tens digit
<span>And 10y+x= the number 


</span>x+y= the sum of the digits 
<span>Now we are told that 10y+x=2(x+y) ------1st equation </span>
<span>We are also told that y=x-7 ----------- 2nd Equation </span>
<span>So our equations to solve are: </span>
(1) 10y+x=2(x+y)
<span>(2) y=x-7 
</span>

Hope it helps
5 0
3 years ago
Read 2 more answers
Simplify 9 log9 (7) is the answer 7
Aleks04 [339]
log_ab=c\ \ \ \Leftrightarrow\ \ \ a^c=b\\\\log_97=x\ \ \ \Leftrightarrow\ \ \ 9^x=7\\\\9^x=7\ \ \ (and \ \ \ x=log_97)\ \ \ \Rightarrow\ \ \ 9^{\big{log_97}}=7
3 0
3 years ago
Write two expressions where the solution is 41.
ladessa [460]

One expression could be.... Nine times 4 plus five equals forty one. ALSO...  Eight times eight equals sixty four then subtract twenty four equals forty one
8 0
3 years ago
For sin2x+cosx=0, use a double-angle or half-angle formula to simplify the equation and then find all solutions of the equation
Archy [21]

Answer:

Step-by-step explanation:

Given is a trignometric equation in x, as

sin2x+cosx=0

TO make it in one trig ratio, we can replace sin2x as 2sinx cosx

WE get now

2sinxcosx+cosx=0\\

cosx(2sinx+1)=0\\cosx=0, sinx =-0.5\\

Principal solution is x=\frac{\pi}{2} , \frac{-\pi}{6}

x = ±π/2 + 2kπ, where k is any integer or

x=±pi/6 +k pi, where k is any integer.

General solution is

4 0
3 years ago
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