Answer:
87.5
Step-by-step explanation:
mental math
y= -32
Step-by-step explanation:
step 1: from the first equation you will make X the subject of formula, the equation then becomes;
X= <u>4-y</u>
2
step 2: substitute X in the second equation, the equation then becomes 5 * <u>[</u><u>4-y</u><u>]</u> + 3y = -6
[ 2]
step 3: find the LCM and then cross multiply; <u>20-5y+6y</u> = -6
2
20+y = -12
y= -12-20
y= -32
4 grams sample will be left after 1 year
Step-by-step explanation:
The decay function for percentage decay is given by:
Here,
a is the initial value
r is the rate
x is the number of time periods
Given
Initial value = 100 grams
Rate = 6% = 0.06
Time = 1 year = 52 weeks
Putting the values in the formula
Hence,
4 grams sample will be left after 1 year
Keywords: Decay, percentage
Learn more about decay functions at:
#LearnwithBrainly
Two equations
W*L=1260
3W+48=L
Solve
L=1260/W
3W+48=1260/W
3W^2+48W=1260
3W^2+48W-1260=0
Divide by 3
W^2+16W-420=0
Factor
(W-14) (W+30)
W=14
L=90
Answer:
x ≠-8 x ≠ -2
Step-by-step explanation:
We cannot divide by zero, so the denominator cannot equal zero
X^2+6x-16≠0
Factor
(x+8) (x-2) ≠0
Using the zero product property
(x+8) ≠0 (x-2) ≠0
x ≠-8 x ≠ -2
