1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
dangina [55]
3 years ago
12

I need help with this please

Mathematics
1 answer:
Aleonysh [2.5K]3 years ago
3 0

Answer:

x=5

Step-by-step explanation:

First, let's understand logarithms.

When there is no base given, like in this problem's right side of the equation, the base is automatically 10.

So, let's re-write that.

\frac{7}{x+2}=log_{10}x+5

Now, let's test a few of the numbers out. For brevity, I already know it's 3. Let's show you why.

\frac{7}{5+2}  =log_{10}(5+5)\\\frac{7}{7} =  log_{10}(10)\\1 = 1

You might be interested in
9. Krista and Emily wrote an equation of a line that is parallel to the line y = 3x - 1 and passing
Andre45 [30]

Step-by-step explanation:

Hey there!

The equation, of a st. line that passes through point (5,9) is,

(y - y1) = m1(y - y1)

Put the values,

(y - 9) = m1(x - 5)

It is 1st equation.

Now, another equation is,

y = 3x-1.........(ii)

Comparing the equation with y = mx+c.

Slope (m2)= 3

As per the parallel lines,

m1=m2=3

Putting,

the value of m1 in equation(i)

(y-9)= 3(x-5)

y-9= 3x - 15

y = 3x - 6.

So, Krista equation is correct.

<em><u>Hope</u></em><em><u> </u></em><em><u>it helps</u></em><em><u>.</u></em><em><u>.</u></em><em><u>.</u></em>

6 0
3 years ago
Convert 22.6 square centimeters to square inches (to the nearest hundredth)
faust18 [17]
I think it is 3.50 but wait until someone else answers
7 0
3 years ago
Read 2 more answers
Please help with this math question​
Sergio039 [100]

Answer:

t = 16/3

Step-by-step explanation:

4/3 : 7= 3t/4 :21

4/3 x 21 = 7 x 3t/4

28 = 21t/4

112 = 21t

t = 112/21 → t = 16/3

7 0
3 years ago
A test has 20 true/false questions. What is the probability that a student passes the test if they guess the answers? Passing me
Minchanka [31]

Using the binomial distribution, it is found that:

The probability that the student will get 15 correct questions in this test by guessing is 0.0207 = 2.07%.

For each question, there are only two possible outcomes, either the guess is correct, or it is not. The guess on a question is independent of any other question, hence, the binomial distribution is used to solve this question.

Binomial probability distribution

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

C_{n,x} = \frac{n!}{x!(n-x)!}

The parameters are:

  • x is the number of successes.
  • n is the number of trials.
  • p is the probability of a success on a single trial.

In this problem:

  • There are 20 questions, hence n = 20.
  • Each question has 2 options, one of which is correct, hence p = \frac{1}{2} = 0.5

The probability is:

P(X \geq 15) = P(X = 15) + P(X = 16) + P(X = 17) + P(X = 18) + P(X = 19) + P(X = 20)

In which:

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

P(X = 15) = C_{20,15}.(0.5)^{15}.(0.5)^{5} = 0.0148

P(X = 16) = C_{20,16}.(0.5)^{16}.(0.5)^{4} = 0.0046

P(X = 17) = C_{20,17}.(0.5)^{17}.(0.5)^{3} = 0.0011

P(X = 18) = C_{20,18}.(0.5)^{18}.(0.5)^{2} = 0.0002

P(X = 16) = C_{20,19}.(0.5)^{19}.(0.5)^{1} = 0

P(X = 17) = C_{20,20}.(0.5)^{20}.(0.5)^{0} = 0

Then:

P(X \geq 15) = P(X = 15) + P(X = 16) + P(X = 17) + P(X = 18) + P(X = 19) + P(X = 20) = 0.0148 + 0.0046 + 0.0011 + 0.0002 + 0 + 0 = 0.0207

The probability that the student will get 15 correct questions in this test by guessing is 0.0207 = 2.07%.

You can learn more about the binomial distribution at brainly.com/question/24863377

6 0
3 years ago
Given four functions, place them in order of their y-intercept, from highest to lowest.
Bas_tet [7]
We are given
f(x) = (x + 4)^(x - 2) + 2
g(x) = 8 (20)^x
j(x) is the given data

We are asked to arrange the functions according to increasing y-intercept. Simply substitute 0 to x and solve for the y-intercept. Doing this, the answer is
<span>C.) f(x), g(x),j(x),h(x)
</span>
8 0
3 years ago
Read 2 more answers
Other questions:
  • A flag pole is 12 feet tall. Its shadow is 10 feet long. What is the approximate distance from the top of the flag pole to the t
    7·1 answer
  • A data set includes data from student evaluations of courses. The summary statistics are nequals99​, x overbarequals3.58​, sequa
    9·1 answer
  • From m2 + 5m - 7 subtract m2 - 3m 4. A) 8m - 3 B) 2m - 11 C) 2m2 + 2m - 11 D) 2m2 + 8m - 11
    12·1 answer
  • Find the area !!!!!!!! Helpppp
    15·1 answer
  • Which equation has an a-value of -2,a b-value of 1 , and a c-value of 3? A. 0=-2x^2+x+3 B. 2x^2+x+3 C. 0=-2x^2+3. 0=2x^2-x+3
    5·1 answer
  • Please help me finish passing
    8·1 answer
  • Variables are defined by what?
    8·2 answers
  • Kyle ordered 7 large pepperoni pizzas from Wild Bill's Pizza, and he used the coupon shown above. If the total bill, after kyle
    8·1 answer
  • Timothy puts $1,500 into a savings account. He receives a
    12·2 answers
  • Given f(x) = -2(x-4)(x+3)(x+1)^2 name all the vertical and horizontal intercepts of the graph
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!