A certain drug is made from only two ingredients: compound A and compound B. There are 5 milliliters of compound A used for every 4 milliliters of compound B. If a chemist wants to make 639 milliliters of the drug, how many milliliters of compound A are needed

355 milliliter.

Step-by-step explanation:

Given:

A certain drug is made from only two ingredients: compound A and compound B.

There are 5 milliliters of compound A used for every 4 milliliters of compound B.

If a chemist wants to make 639 milliliters of the drug, how many milliliters of compound A are needed ?

Solution:

As 5 milliliters of compound A is used for every 4 milliliters of compound B.

Ratio of compound A and compound B = 5 : 4

Let ratio be

Quantity of compound A in milliliter =

Quantity of compound B in milliliter =

Now, we have to make 639 milliliters of the drug,

Quantity of compound A + Quantity of compound B =  639 milliliters

Dividing both sides by 9

Quantity of compound A in milliliter = =

Therefore, 355 milliliter of compound A are needed to make 639 milliliters of the drug.

a. is correct

the solution is x=1

step-by-step explanation:

we are given our   equation as

let's assume

left side function is

right side function is

now, we can draw graph

and then we can get intersection point

the intersection point will be solution

so, the solution is

x=1