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
AlexFokin [52]
3 years ago
7

two years ago jenny was four times as old as helen. six years from now jenny will be twice as old as helen. how old are the girl

s now
Mathematics
2 answers:
vladimir1956 [14]3 years ago
7 0
Let Jenny's age (today) be J and Helen's age (today) be H We have the following equations: J-2 = (H-2)4J+6 = (H+6)2 Simplify J-2 = 4H-8J+6 = 2H+12 J=4H-6J=2H+6 Solve the system of equations by elimination -J=-4H+62J=4H+12 J=18 → plug into original equation → 18=4H-6 → 24=4H → H=6 We can check to verify if needed, but we will get that Jenny is 18 and Helen is 6 
Elina [12.6K]3 years ago
5 0
What  type of teacher would give a frustrating problem like this?!?
You might be interested in
Students in a statistics class are conducting a survey to estimate the mean number of units students at their college are enroll
Papessa [141]

Answer:

The 95% confidence interval for the average number of units that students in their college are enrolled in is between 11.7 and 12.5 units.

Step-by-step explanation:

We have the standard deviation for the sample, so we use the t-distribution to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 45 - 1 = 44

95% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 44 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.95}{2} = 0.975. So we have T = 2

The margin of error is:

M = T\frac{s}{\sqrt{n}} = 2\frac{1.5}{\sqrt{45}} = 0.4

In which s is the standard deviation of the sample and n is the size of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 12.1 - 0.4 = 11.7 units

The upper end of the interval is the sample mean added to M. So it is 12.1 + 0.4 = 12.5 units

The 95% confidence interval for the average number of units that students in their college are enrolled in is between 11.7 and 12.5 units.

8 0
2 years ago
Diego’s dog weighs more than 8 kilograms and less than 12 kilograms. Select all the inequalities that MUST be true if w is the w
masha68 [24]

Answer:

4 less kilgrams than previous weight

Step-by-step explanation:

7 0
2 years ago
What are common multiples of 7 and 4
Sergeu [11.5K]

Answer:

28, 56, 84, 112, etc.

Step-by-step explanation:

Since 28 is the first number they have in common, 28 is the least common multiple of 4 and 7.

8 0
3 years ago
Mr. Bulky’s Candy Emporium sells all candy items for $0.60 per ounce. Penny and Ruth each bought several different types of cand
exis [7]

Answer: what’s the rest of the question? You didn’t provide enough data…✨

Step-by-step explanation:

4 0
2 years ago
Find the value of x.<br> 50
Mariana [72]

Answer:

x = 18 degrees

Step-by-step explanation:

50 - 32 = 18

7 0
2 years ago
Read 2 more answers
Other questions:
  • Write the equation of a line that is parallel to x=8 and that passes through the point (-3,-2)
    14·1 answer
  • One-eleventh of all sales at Joe's Diner are for cash. If cash sales for the week were $380, what were Joe's total sales?
    15·1 answer
  • A t statistic was used to conduct a test of the null hypothesis H0: µ = 11 against the alternative Ha: µ ? 11, with a p-value eq
    15·1 answer
  • GeoA Test 3-1 3-2 Version 1
    13·1 answer
  • HELP ASAP! WILL GIVE BRAINLIEST AND 20 POINTS!
    11·2 answers
  • How to do this part
    7·1 answer
  • Penny buys 3 bouquets of flowers for $3 each and 4 bouquets for $2 each. Which expression gives the total cost of the bouquets t
    8·2 answers
  • A park in a subdivision has a triangular shape. Two adjacent sides of the park are 533 feet and 525 feet. The angle between the
    8·1 answer
  • Find the solution to:<br> y=0.5+1<br> y=2x-2
    7·2 answers
  • The length of a rectangle is three more than twice the width. Determine the dimensions that give a total area of 27ft squareda.
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!