Jenny wants a total of 12 barbies dolls by the time she is 9 years old. right now she has 4 barbie dolls. how many more does she need? write an equation and solve.
a) x + 4 = 12; jenny needs 8 more barbie dolls.
b) 4x = 12; jenny needs 3 more barbie dolls.
c) x-4=12; jenny needs 16 more barbie dolls.
d) x + 12 = 4; jenny needs 8 more barbie dolls.

answer:

it is general formula that is used to write value to its excet position

a11 a12 a13

a21 a22 a23

it is the example of order 2 by 3 matrix in this

a11 means value occur in 1 st row 1st column

a12 means value occurs in 1st row 2nd column

a13 means value occur in 1st row and 3rd column

a21 means value occurs in 2nd row and 1st column

a22 means value occurs in 2nd row and in 2nd column

a23 means value occurs in 2nd row and in 3rd column

the answer is:

the answer is:

to solve the problem, we need to remember the quotient of power property, it's defined by the following relation:

if we have a quotienf of powers that have the same base, we need to keep the same base and subtract the exponent of the denominator power to the exponent of the numerator power.

so, we are given the expression:

then, calculating we have:

hence, the answer is:

have a nice day!

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