Four times the difference of a number and nine is -30 (write into an equation)

4(x - 9) = -30

Step-by-step explanation:

"times" is multiplication

"difference" is subtraction

"is" means equals

4 times    the difference of a number and nine       is -30

4   ×        (                                x        -         9      )       = -30

⇒ 4(x - 9) = -30

f(2x−x2)=−3x2+6x−1

step-by-step explanation:

set up the composite function and evaluate.

f(2x−x2)=−3x2+6x−1

the total estimated nappy use.=10,500,000

step-by-step explanation:

given that on an average the average baby uses 3528 napkins.

in a particular year 2014, the number of births were 299697 in new south wales.

rounding off the number of births to the nearest hundred thousand we have

no of birtsh = 300000

also rounding off the average usage to nearst thousand we get

average use of a baby = 3500

hence total number of nappy estimated to be used = 3500x300000

= 10,500,000

answer is 10,500,000 nappies