Roast beef has 25g of protein and 11g of calcium per serving. a serving of mashed potatoes has 2g of calcium and 25g of calcium. how many servings of each are needed to supply exactly 25g of protein and 61g of calcium?

Let R and M be the numbers of serving of roast beef and mashed potato.

25R     +    2M      =   29   >  1

11R      +     25M      =     61 >    2

From (1): 2R   =   29    -    25M

or     M   =     29/2     - 25/2 R

Substitute this into (2):

11R      +      25(29/2     -     25/2 M)     =     61

11R      +       362.5      -       312.5R     =     61

301.5      =       301.5R

R      =        1

Using    R     =     1, we can get

11(1)      +     25M     =      61

25M       =      50

M         =           2

Therefore, you will need ONE SERVING  of Roast Beef and TWO SERVINGS of Mash Potatoes.

Hope that helps                                                : )

b.-4 units

all you   do is count how many times you move

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!