How do i solve 7x-y=21

Answers

Answer 1

Answer: it is 3 because we multiply 3 and 7 and we get 21

Answer 2

Answer: The answer answer is actually -3 because you divided 7 from 21 and you get 3 then you divided -1 because the y has a negative sing on it and you want it to be positive. That is why the answer is -3

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Sorry guys today is not my day :( Please show your work
I need helps please and ty

Janene is solving the equation log3x324=2. Which exponential equation can she use to solve the problem?A. 324^2=3x
B. 334^x=2/3
C. (3x)^2=324
D. 3x^2=324

Answers

Answer:

Option C: (3*x)^2 = 324

Step-by-step explanation:

Janene is solving the equation:

Log₃ₓ(324) = 2

First, some rules we need to remember:

Logₙ(x) = Ln(x)/Ln(n)

and:

Ln(x^b) = b*Ln(x)

So we can rewrite our expression as:

Log₃ₓ(324) = Ln(324)/Ln(3*x) = 2

Ln(324) = 2*Ln(3*x)

Now we can use the second property:

Ln(324) = 2*Ln(3*x) = Ln( (3*x)^2 )

The arguments in both sides must be the same thing, then:

324 = (3*x)^2

This is the exponential equation she needs to solve.

Then the correct option is C.

Which counterexample disproves this statement?
for all integers x, 1/x less than or equal to x

Answers

One counter example would be -2. -1/2 is more than -2.

How to solve 2^(log(2)3+ log(2)5

Answers

$2^(log_23+log_25)=2^(log_2(3\cdot5))=2^(log_215)=15\n\n---------------------------\n\nfor\ a,b,c\in\mathbb{R^+}\n\nlog_ab+log_ac=log_a(b\cdot c)\n\na^(log_ab)=b$

$2^(\log_23+ \log_25 )=\n 2^(\log_215)=\n 15$

A rectangle and a triangle with the same base and height have the same area. a. True
b. False

Answers

the answer is false because if you attach to triangles together in a way so that the figure would have 4 straight lines, you will get a rectangle. that means half of a rectangle is a triangle, so the area of both cannot be the same even if they have the same base and height.

for example the base and height of both is 3cm and 5cm.

area of the rectangle then would be,
area= base× height
=3cm×5cm=15cmsquared

then the area of the triangle would be,
area= base×height divided by 2
=3cm×5cm÷2= 7.5cm

so your answer is false
hope this helps....

Answer:

The Answer is False

A homeowner chooses 9 of 25 plants at a nursery to landscape her front yard. Which expression gives her the number of ways she can choose the plants?9C25

9P25

25P9

25C9

Answers

The correct answer is 25C9

What did I do wrong in notes, and why is the answer what it shows on screenshot

Answers

Answer:

Hope you find it helpful and usef

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Joshua sells a pack of pens for $3.15 which is 5 percent more that he pays for them. Which equation will help find x, the amount he pays for a pack of pens? how many solutions will this equation have?A) x+0.05x=3.15 infinitely many solutions.B) x+0.5x=3.15 one solutionC) x+0.05=3.15 one solutionD) 0.05x=3.15 no solution