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
gladu [14]
3 years ago
14

Roberto is 3 years older than Carolyn. In 7 years the sum of their ages will be 81. How old is Roberto now?

Mathematics
1 answer:
Nuetrik [128]3 years ago
3 0

Answer: 35

the age of Roberto is x (x > 3)(x ∈ N)

because Roberto is 3 years older than Carolyn => the age of Carolyn is x - 3

in 7 years, the age of Roberto is x + 7; the age of Carolyn is x - 3 + 7 = x + 4

because  In 7 years the sum of their ages will be 81 =>

x + 7 + x + 4 = 81

⇔ 2x + 11 = 81

⇔ 2x = 70

⇔ x = 70/2 = 35

=>  the age of Roberto is 35

Step-by-step explanation:

You might be interested in
P(A) = 20%. P(B) = 50%. P(BIA) = P(B). What is P(A and B)?
8_murik_8 [283]

Answer:

P(A and B) = 0.1 = 10%

Step-by-step explanation:

Conditional Probability

We use the conditional probability formula to solve this question. It is

P(B|A) = \frac{P(A \cap B)}{P(A)}

In which

P(B|A) is the probability of event B happening, given that A happened.

P(A \cap B) is the probability of both A and B happening.

P(A) is the probability of A happening.

In this question, we have that:

P(A) = 0.2, P(B|A) = 0.5

What is P(A and B)?

P(B|A) = \frac{P(A \cap B)}{P(A)}

P(A \cap B) = P(B|A)*P(A) = 0.5*0.2 = 0.1

P(A and B) = 0.1 = 10%

8 0
3 years ago
What is the value of B?
diamong [38]

Answer:

The value of B is 0 because going down from the middle is all negative and going up from point B is all positive so the answer is 0 degrees

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Katie is planting a garden for her science fair project. She needs 2/3 of a cup of soil to go in 8 different pots. How many cups
astraxan [27]

2/3 * 1/8 = 2/24 = 1/12

7 0
4 years ago
I need help with #3 & #4
lina2011 [118]

Step-by-step explanation:

Q3, B

Q4, I'm not too sure about this one but I think its D

5 0
3 years ago
A rectangle classroom is 9 feet wide. It is five times as long as it is wide. What is the perimeter of the classroom?
telo118 [61]

Answer:

The perimeter is 100 ft

Step-by-step explanation:

Width = 9 ft

It is five times as long as it is wide

Length = 5*width = 5*9 = 45 ft

P = 2(l+w)

   =2(45+5)

   =2(50)

   = 100 ft

8 0
4 years ago
Other questions:
  • A classroom has a total of 26 students, 13 Students in the classroom are females and the rest are males. ​5 males students have
    7·1 answer
  • What is -5 plus -10 minus 41562 times 6
    9·2 answers
  • What are good ideas for a jingle thing?
    5·1 answer
  • 15z + 3y = 21<br> Solve the formula for y
    10·2 answers
  • Sam opened a money-market account that pays 5% simple interest. He started the account with $7,000 and made no further deposits.
    12·1 answer
  • A) 31 c) 30<br><br> b) 28 d) 61
    12·1 answer
  • Please answer all of these in the following way :
    7·1 answer
  • Simplify:<br> 7x3 + 5x2 – 2 = [?]<br> X=-1
    12·1 answer
  • Plssssssssssssssssssssssssssssssssssssssssssss
    6·1 answer
  • The area of a rectangle is 96 sqaured meters with the width of 8 meters. Write an equation to find the length of the rectangle.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!