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
Alex73 [517]
3 years ago
8

Alfonso is 8 years older than Ashley. Five years ago Alfonso was three times as old as Ashley. How old is Ashley now?

Mathematics
2 answers:
Pavel [41]3 years ago
8 0

Answer: 9 years


Step-by-step explanation:

Let the present age of Ashley be x.

Then the present age of Alfonso =x+8

Five years ago,

Ashley's age = x-5

Alfonso's age = x+8-5 = x+3

According to the question,

x+3=3(x-5)\\\Rightarrow\ x+3=3x-15\\\Rightarrow\ 3x-x=3+15\\\Rightarrow\ 2x=18\\\Rightarrow\ x=\frac{18}{2}\\\Rightarrow\ x=9

Hence, the present age of Ashley =9 years

Pepsi [2]3 years ago
3 0
Ashley should be 9 years of age.
You might be interested in
he mean age of bus drivers in Chicago is greater than 54.4 years. If a hypothesis test is performed, how should you interpret a
Natalka [10]

Answer:

There is not sufficient evidence to support the claim μ > 54.4.

Step-by-step explanation:

1) Previous concepts

A hypothesis is defined as "a speculation or theory based on insufficient evidence that lends itself to further testing and experimentation. With further testing, a hypothesis can usually be proven true or false".  

The null hypothesis is defined as "a hypothesis that says there is no statistical significance between the two variables in the hypothesis. It is the hypothesis that the researcher is trying to disprove".

The alternative hypothesis is "just the inverse, or opposite, of the null hypothesis. It is the hypothesis that researcher is trying to prove".

2) Solution to the problem

On this case we want to test is \mu>54.4 and the system of hypothesi on this case are:

Null Hypothesis: \mu \leq 54.4

Alternative hypothesis:\mu >54.4

On this case is our decision is FAILS to reject the null hypothesis then we can conclude that we don't have enough evidence to support the claim at the significance level provided.  So the correct conclusion would be:

There is not sufficient evidence to support the claim μ > 54.4.

8 0
3 years ago
8 Heights below sea level can be shown by using negative numbers.
fredd [130]
Answer: 650 Ft above the trough of the valley. Explanation 450 - (-200) = 650
7 0
3 years ago
Evaluate the given algebraic expressions replacing x with -2 and y with 1<br><br>3x^2
Anvisha [2.4K]

Answer:

12

Step-by-step explanation:

3x^2

because the information provided states that x = -2, that is what we are going to replace x with.

3(-2)^2

the next step is to evaluate the power because that is next in PEMDAS.

(-2)^2 = 4

that leaves us with:

3 * 4 = 12      ( the " * " represents the multiplication sign)

hope this helps!

3 0
2 years ago
Is 6.31 repeating rational or irrational​
leonid [27]
6.31 is a rational number.
4 0
3 years ago
Simplify (6.89 + 14.52) + (-14.52)=
FinnZ [79.3K]
Adding 14.52 and -14.52 cancels it out

The answer is 6.89

I hope that helps!
3 0
3 years ago
Other questions:
  • You are given the function f(x)=1/x^2+10. f(x) is concave up whenever: A. x^2−10 is negative. B. 3x^2−10 is positive. C. 3x^2+10
    12·1 answer
  • Bill must take an 8-question true/false quiz and has to guess on each problem. How many
    6·1 answer
  • Renna pushed the button for the elevator to go up, but it would not move. The weight limit for the elevator is 450 kilograms, bu
    8·1 answer
  • Three times the sum of a number and 21 is at most -26
    11·1 answer
  • Find all zeros x^3+2x^2+4x+21
    8·1 answer
  • What is the factor form?
    6·2 answers
  • Suppose a sample of 256 was taken from a population with a standard deviation of 64 centimeters. What is the margin of error for
    12·2 answers
  • Chicken breasts are sold for $2.99 per pound. One pack contains 1.59 pounds; how much does the pack cost?
    13·1 answer
  • A pet store has 9 tanks of fish. There are 5 fish in each tank. How many fish does the pet
    5·2 answers
  • Solve each inequality.<br> X+5 &lt; 6 <br> Pls help
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!