8. The density (D) is related to the mass (M) and the volume (V) of a substance by the formula D=m/v

(a) Transpose the equation to make M the subject and hence find the mass when the volume is 12 and the density is 7. (2)

(b) Transpose the equation to make V the subject and hence find the volume when the mass is 3.4 and the density is 1.8.

M = 84

V = 1.89

Step-by-step explanation:

We are given the formula:

D = M/V

Where D is the density, M is the mass, and V is the volume of a substance.

(a) We'll use transposition to make M the subject of the equation.

To isolate M, we need to multiply by V on both sides of the equation:

D*V = M/V * V

The right side of the equation simplifies:

D*V = M

Now we swap sides:

M = D*V

Substituting the given values of V=12 and D=7:

M = 7 * 12 = 84

M = 84

(b) Now we must make V the subject of the equation:

D = M/V

Again, we multiply by V:

D * V = M

Now divide by D:

V = M/D

Substitute M=3.4, D=1.8:

V = 3.4/1.8

V = 1.89

its definatley   this on your answer choice?

answer

a,b, and d

explanation

a reflection angle is more than

but less than;

an angle that measures

is a reflex angle.(true)

an angle that measures less than

is acute.(true)

provided we are considering angles greater or equal to zero.

an acute angle lies in the range.

an obtuse angle is less than 180° but more than 90°

an angle that measures 300° is obtuse (false)

an angle that measures 65° is an acute angle.(true)