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Lera25 [3.4K]
3 years ago
9

What is the value of k?k=​

Mathematics
1 answer:
Molodets [167]3 years ago
3 0
Where is the equation or expression?
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A circular lawn has a row of bricks around the edge. The diameter of the lawn is about 40 feet.​
Luba_88 [7]

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5 0
3 years ago
Solve the logarithmic equation: x= log5 (1/625)=
Verizon [17]
You can convert (1/625) to an exponent, and it would be ideal to have 5 as the base of it because you want your log base to cancel it out. what i usually do in this case is just test out 5^1, 5^2, etc until i find one that matches the number i need. in this case because the number you're trying to work with is a small fraction, you'll want to use NEGATIVE exponents so it'll create a fraction instead of a large whole number:

5^-1 = 1/5
. . . keep trying those. . .
5^-4 = 1/625

so, because they're equal to one another, it'll be waaay easier after you substitute 5^-4 in place of 1/625

x = log₅ 5⁻⁴

log base 5 of 5 simplifies to 1. subbing in the 5^-4 gets rid of the log for you altogether, and your -4 exponent drops down:

x = -4 is your answer

if the exponent dropping down doesn't make sense to you, you can think of it in another way:

x = log₅ 5⁻⁴

expand the expression so that the exponent moves in front of the log function:

x = (-4) log₅ 5

then, still, log base 5 of 5 simplifies to 1, so you're left with:

x = (-4)1 or x = -4
5 0
3 years ago
5 If 15 cookies cost $8.50, how much would it cost for 25 cookies? Write a proportion and solve it below:​
AlladinOne [14]

Answer:

14.25

Step-by-step explanation:

8.5/15=0.57

1:0.57

0.57*25=14.25

6 0
2 years ago
Which system is represented by the graph shown here
icang [17]
A; first equation is the red one and second is the blue one
4 0
3 years ago
Read 2 more answers
The formula for the perimeter of a rectangle is P = 2l + 2w. The length of a rectangle is 3 times its width. Which expression re
blondinia [14]
The third one would be the answer.
4 0
3 years ago
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