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
Sergeu [11.5K]
3 years ago
10

The recommended heart rate for weight management exercise and improving cardio fitness, in beats per minute, depends on a person

's age and can be represented by the expression 0.7(220-a) what is the recommended heart rate for a 20 year old person?
Mathematics
2 answers:
Sidana [21]3 years ago
7 0

As per the question, the recommended heart rate (beats per minute) can be represented by the expression 0.7(220-a), i.e. 0.7 * (220-a), where a is the age of the person.

We have to determine the recommended heart rate for a 20-year old person.

Substituting the value 20 for a in the expression

⇒ Recommended heart rate = 0.7 * (220 - 20)

⇒ Recommended heart rate = 0.7 * (200)

⇒ Recommended heart rate = 140 beats per minute

hichkok12 [17]3 years ago
6 0

Answer:

Recommended heart rate of a person of age 20 years will be 140 beats per minute.

Step-by-step explanation:

Expression representing the heart rate in terms of beats per minute is = 0.7(220 - a) where a = age of the person.

Now we have to calculate the recommended heart rate for a person having age = 20 years.

Now we put a = 20 in the expression

Heart rate = 0.7(220 - 20)

                 = 0.7×(200)

                 = 140 beats per minute

Therefore, recommended heart rate of a person of age 20 years will be 140 beats per minute.

You might be interested in
HELP ME ASAP<br> 20 points !!!
Molodets [167]
Mode means ‘most often number’ .

The most often numbers are:
20 and 16

Reason:
20 is shown 3 times.
16 is shown 3 times.
19 is shown 2 times.
18 is shown once.

So, the two most occurring/often numbers are 20 and 16.

Give this answer Brainliest!
3 0
1 year ago
Which of the following is equivalent to sec2θ−1sec2θ for all values of θ for which sec2θ−1sec2θ is defined?
galina1969 [7]

Answer:

2 sin^2 \theta

Step-by-step explanation:

According to the scenario, the following information is given:

= \frac{sec^2 \theta - 1 }{sec^2 \theta}

= (\frac{1}{\frac{cos^2\theta}{\frac{1}{cos^2\theta} }} - 1)

= 1 - cos^2\theta\\\\= 1 - (1 - 2 sin^2 \theta)\\\\= 2 sin^2 \theta

Therefore for the given equation, the answer is 2 sin^2 \theta

5 0
3 years ago
The radius of a sphere-shaped balloon increases at a rate of 2 centimeters (cm) per second. If the surface area of
djverab [1.8K]

Answer:

7 seconds

Step-by-step explanation:

The radius of a sphere-shaped balloon increases at a rate of 2 centimeters (cm) per second.

surface area of the completely inflated balloon is 784 cm²

SA=4r²

784= 4r²

784/4= r²

196 = r²

14cm = r

Yhe radius of the complete inflated balloon is 14cm

If the ball inflate at the rate of 2 cm per seconds

Then it took 14/2 = 7 seconds to inflate fully

5 0
3 years ago
Please help me hurry please
aalyn [17]

Answer:

y = root under 24 (evaluate it if necessary)

or y = 2 root 6

Step-by-step explanation:

Let the reference angle be x

for the triangle in left,

b = 6-4 = 2

Now,

taking x as refrence angle,

cosx = b/h

or, cosx = 2/h

again,

for the bigger triangle,

taking x as reference angle,

cosx = b/h

or, cosx = b/6

As we can see base of bigger triangle is equal to hypotenuse of triangle at the left,

Let's suppose its a

so, cosx = a/6 = 2/a

now,

a/6 = 2/a

or, a² = 12

now,

for bigger triangle, using pythagoras theorem,

h² = p²+b²

or, 6² = y² + a²

or, 36 = y² + 12

or, y² = 24

so, y = root under 24

5 0
2 years ago
What is the best estimate for the area of circle A, in square units? Use the approximation “pie”≈3.14.
amm1812

Answer:

153.86 un²

Step-by-step explanation:

Area circle = πr²

Radius is the distance of the center to the edge(perimeter)

Radius = 7

Area circle = 3.14(7)²

Area circle = 3.14 * 49 = 153.86

If my answer is incorrect, pls correct me!

If you like my answer and explanation, mark me as brainliest!

-Chetan K

7 0
3 years ago
Read 2 more answers
Other questions:
  • FInd BD, Given FE=23.5 will mark Brainliest please answer ASAP
    8·1 answer
  • The tires on Pablo's bicycle have a radius of 10 inches. Use the appropriate formula model to find the circumference. What is th
    9·1 answer
  • 8-2 3/4 please help im so confused...
    9·2 answers
  • A line passes through the points (–2, –8) and (–4, –8). Which shows the graph of this line?
    14·2 answers
  • Sasha can run at an average speed of 934 9 3 4 min/mi. She runs at this speed for 6814 68 1 4 min. How many miles does Sasha run
    6·1 answer
  • Given (8x+3k)(9x−2)=0, the product of all solutions is (−3). Find k.
    9·1 answer
  • Yvonne had a gross income of $16,800 in 2009. When filing her federal
    9·2 answers
  • The graph of a system of equations with the same slope and the same y-intercepts will have no solutions.
    10·1 answer
  • 12 43 a а- 5 6 b + 8 7 Line a is parallel to line b, m 2 = 4x+44, and m 46 = 6x +36 . Find the value of x.​
    9·1 answer
  • Cual es la ley que establece que la suma o producto de dos números reales no dependen del orden en que se presentan los factores
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!