# what is the rule for solving proportions? A. The sum of the means is the product of the extremes. B. The product of the means is equal to the product of the extremes. C. The product of the extremes is twice the product of the means.

Answer: The rule is that :
B. The product of the means is equal to the product of the extremes

## Related Questions

A person's systolic blood pressure, which is measured in millimeters of mercury (mm Hg), depends on a person's age, in years. The equation: P = 0.007 y 2 − 0.01 y + 122
gives a person's blood pressure, P , at age y years.

A.) Find the systolic pressure, to the nearest tenth of a millimeter, for a person of age 44 years.

B.) If a person's systolic pressure is 133.36 mm Hg, what is their age (rounded to the nearest whole year)?

(A)The systolic pressure of a person of age 44 is 135.1 mm Hg

(B) If a person's systolic pressure is 133.36 mm Hg, their age is 41 years.

Step-by-step explanation:

Given : P = 0.007 y² - 0.01 y +122

where P is systolic pressure and y is age of a person

(A) Here age of the person, y =44

So, P =0.007 (44²) -0.01 (44) +122 = 13.552 -0.44 +122 = 135.112 =135.1 mm

∴ The systolic pressure of a person of age 44 is 135.1 mm Hg

(B) Here P = 133.36 mm Hg

So,

133.36 = 0.007 y² - 0.01 y +122

=>0.007 y² -0.01 y -11.36 =0

=> 7 y² -10 y -11360 =0

or

y = 41 or y = -39.57

Since age cannot be negative, y= 41

∴ If a person's systolic pressure is 133.36 mm Hg, their age is 41 years.

The width of the rectangle is x inches and the length is (6v+7).Writen an equivalent expression to represent the perimeter of the rectangle (6v+7+v+6v+7+v.

P= 6v+7+v+6v+7+v
Perimeter equals 2 times length plus width

EQUIVALENT EXPRESSION
P= 2(length + width)
P= 2(v+6v+7)

Hope this helps! :)

A regular #2 pencil can draw a line about 35 miles long or write roughly 45,000 words. How many words will fit in one mile?

45,000 words=35 miles
x words=1 mile
Divide 45,000 by 35 to get the unit rate for words per mile.
45000/35=1285.71429

Hope this helps :)

This dot plot shows the number of cakes sold each day in aunt alice's cake shop last month. what is the median number of cakes sold each day?