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Licemer1 [7]
3 years ago
14

Please I need help? ​

Mathematics
1 answer:
jasenka [17]3 years ago
5 0
I think the answer is -9x+4y= -38
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A person’s theoretical maximum heart rate (in heartbeats per minute) is 220 - x where x is the person’s age in years (20 ≤ x ≤ 6
Lyrx [107]

Let f(x) represents the heart beat of the person.

Now, we have been given that person’s theoretical maximum heart rate is given by  220 - x.

Also, we have been given that person strive for a heart rate that is at least 50% of the maximum. At least means greater than equal to.

Thus, we have

f(x)\geq (220-x)0.5\\
f(x)\geq 110-0.5x

Also, we have been given that person strive for a heart rate that is at most 75% of the maximum. At most means less than equal to.

f(x)\leq (220-x)0.75\\
\\
f(x)\leq 165-0.75x

Therefore, the system of inequality is given by

f(x)\geq 110-0.5x\\
f(x)\leq 165-0.75x

6 0
3 years ago
HELP ASAP ~ WILL GIVE BRAINLIEST ASAP
dimaraw [331]

Answer:

Domain [-5,∞)

Range [0,∞)

Step-by-step explanation:

Part 1) Find the domain

we have

f(x)=\frac{1}{2}\sqrt{x+5}

we know that

The radicand must be greater than or equal to zero

so

x+5\geq 0

solve for x

subtract 5 both sides

x\geq -5

The solution for x is the interval [-5,∞)

All real numbers greater than or equal to -5

Remember that

The domain of a function is the set of all possible values of x

therefore

The domain of the function f(x) is the interval  [-5,∞)

Part 2) Find the range

we have

f(x)=\frac{1}{2}\sqrt{x+5}

Find the value of f(x) for the minimum value of x

For x=-5

f(x)=\frac{1}{2}\sqrt{-5+5}

f(x)=0

The minimum value of f(x) is equal to zero

so

The solution for f(x) is the interval [0,∞)

All real numbers greater than or equal to 0

Remember that

The range of a function is the complete set of all possible resulting values of y, after we have substituted the domain.

therefore

The range of the function is the interval [0,∞)

8 0
3 years ago
Can't figure out math quiz
Llana [10]

Answer:

am not sure to but i think it should be 65 degree

7 0
3 years ago
HELPPP!!! Pls /: need help asap
Llana [10]
V(s) = s^3 should be the correct answer. Hope this Helps!
3 0
3 years ago
Lina has five more than seven times as many pictures as photo albums. If she has 75 pictures, how many photo albums does she hav
8090 [49]

Answer:

photo albums = x

pictures =75( seven times of albums +5)

so

seven times of x is 7x and +5

7x +5 = 75

7x= 75-5

7x = 70

x=70÷7

x =10

x = 10 = photo albums

3 0
3 years ago
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