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4 Paula is adjusting the level of chlorine in the pool at the local community center. The
concentration of chlorine is currently 6.3 parts per million. She read in a magazine that
the ideal chlorine level is about 1.5 parts per million. How many times the ideal chlorine
level is the current chlorine level?
I
A 4.2 times
Б. 4.8 times
с 7.8 times
D. 9.5 times

A. 4.2 times

Step-by-step explanation:

Chlorine level of the pool as adjusted by Paula = 6.3 parts per million

Ideal Chlorine level as suggested by the magazine = 1.5 parts per million.

Thus, the number of times the ideal level of Chlorine that the current level is = current level ÷ ideal level

=

The current Chlorine level is 4.2 times the ideal Chlorine level.

d i think

step-by-step explanation:

b

step-by-step explanation:

the equation of a line in point- slope form is

y - b = m(x - a)

where m is the slope and (a, b) a point on the line

calculate m using the slope formula

m = (y₂ - y₁ ) / (x₂ - x₁ )

with (x₁, y₁ ) = (0, 4) and (x₂, y₂ ) = (3, - 5) ← 2 points on the line

m = = = - 3

with m = - 3 and (a, b) = (3, - 5), then

y - (- 5) = - 3(x - 3), that is

y + 5 = - 3(x - 3) → b