18
Jenny is asked to find the value of
12- 2 x 4
Here is her working.
12 - 2 x 4 = 10 x 4 = 40
Jenny's answer is wrong.
Explain what Jenny has done wrong.

see explanation

Step-by-step explanation:

Jenny has followed the wrong order of operations, in that she has subtracted before multiplying.

Following the order as directed by PEMDAS

Multiplication is performed before subtraction

Given

12 - 2 × 4 ← perform multiplication

= 12 - 8 ← perform subtraction

= 4

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.

a.) list the factors of 40.

1/2/4/5/8/10/20/40

b.) list the factors of 40 that represent the number of cans that could be on each shelf.

5

c.) how many different arrangements of cans are possible?

just one because if you put more on one shelf you will go way over 40 and the cabinet will probably break.

d.) what are the possible arrangements of the cans?

put 5 cans on each self to reach 40 cans in total.

e.) which arrangement uses all the shelves?

5 because you can put 5 cans on each shelf, and since there are 8 shelfs you are equally going to get 40 cans.