Answer:
12.5
Step-by-step explanation:
(7/2) = 3.5
(3.5)^2 = 12.5
Life expectancy of dollar bill = d
life expectancy of coin = c
d = 1/20 c
substitute value in for c (30)
d = 1/20 * 30
d = 30/20
d = 1.5
life expectancy of a dollar bill = 1.5 years
John bought 18 erasers.
Explanation: He has $6.00
He spends $3.12 on notebooks
Then you do $6.00 - $3.12 and you get $2.88
If it’s ¢16 per eraser and he has no money left over after buying erasers than you would divide $2.88 by $0.16 which turns into 288 divided by 16 which comes out to 18.
Therefor John bought 18 erasers.
Answer:
let the breadth of room be 'x'm
so the lenghth of room is 'x+8'm
Given
Area of room=48m²
i.e length ×breadth =48m²
or,(x+8)x=48
or,x²+8x-48=0
or,x²+12x-4x-48=0
or,x(x+12)-4(x+12)=0
or,(x+12)(x-4)=0
Either x+12=0
or,x=-12(which is not possible)
Or,x-4=0
or,x=4
Thus,breadth is 4m.
length=x+8=4+8=12m
The dimensions of room are 8m and 12m respectively.
The last term is 58. List out the ways to multiply two whole numbers to get to 58
1*58 = 58
2*29 = 58
(-1)*(-58) = 58
(-2)*(-29) =58
Then go through those factors and see which two values add to 6 (which is the middle number in the given expression)
1+58 = 59
2+29 = 31
-1+(-58) = -59
-2+(-29) = -31
None of those sums are 6, so the original expression cannot be factored. It is said to be prime.
