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Lelu [443]
3 years ago
12

Medical researchers have determined that for exercise to be beneficial, a person’s desirable heart rate, R, in beats per minute,

can be approximated by the formulas
R=143-0.65a for women
R=165-0.75a for men,

where a represents the person’s age. If the desirable heart rate for a man is 135 beats per minute, how old is he?
a.22.5 years old
b.40 years old
c.45 years old
d.42.5 years old



Evaluate the function
f(x)=1/2x+3

for f(4).
a. 5
b. 9
c. 11
d. 14
Mathematics
1 answer:
yan [13]3 years ago
6 0

we are given with two equations: R=143-0.65a for women and R = 165-0.75a for men. In this prblem we are asked the age of a man when R is equal to 135. In this case, we use the second equation and substitute R with 135. In this case, 135 = 165 - 0.75 a; a is equal then to 40 yrs old. In 2, when x is equal to 4, then 0.5*4 + 3 is equal to 5. 
You might be interested in
Multiply (x + 14)(x + 15). What is the product?
Contact [7]

Answer:

x^2+29x+210

I hope this helps! I did this through the FOIL method. :)

5 0
3 years ago
This year the fifth grade collected 216 fewer plastic containers than the fourth grade.How many plastic containers did the fifth
kap26 [50]

Let number of plastic containers collected by fourth grade= x

Then number of plastic containers collected by fifth grade students=x-216

OR

If number of plastic container collected by fifth grade is y

then number of plastic container collected by fourth grade=y+216

So, we can write it as follows

⇒ number of plastic containers collected by fourth grade= number of plastic containers collected by fifth grade +216



7 0
3 years ago
terry opened a savings account in December with $132 and saved $27 each month beginning in January the value of terrys account i
liq [111]
Let S be the amount in a savings account. 
Let m be the number of months.

General equation
S = 132 + 27m

Specific question
July is the 7th month of the year including both January and July.
S = 132 + 7*27
S = 132 + 189
S = 321

Reasonableness?
Good question. You could estimate an answer.
Start with 150 dollars and say that you add 25 a month.
7 * 25 = 175
S = 150 + 175 = 325 All of this was done in my head. Since the exact answer obtained using the formula is 321, I think that's pretty reasonable using my estimate is a guide.
4 0
3 years ago
Brittany has a gift box in the shape of a cube. Each side of the box measures 15 cm. what is the volume of the gift box?
miss Akunina [59]
The formula for the volume of a cube is:

v=s³

Where v=volume and s=the length of a side

Since we know that the length of a side of the gift box is 15cm, we can solve for the volume.

v=15³=3375cm³

Answer: V=3375cm³
7 0
3 years ago
Read 2 more answers
Heyyy help maybe????????????
ZanzabumX [31]
Its 1 2/3 yards

Since 3 ft = 1 yard
8 0
3 years ago
Read 2 more answers
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