Answer:
158 cases
Step-by-step explanation:
Given tbe quadratic regression model :
y = -2x^2 + 40x + 8
y = number of cases of a new disease
x = number of years
The predicted number of cases of a new disease in 15 years can be calculated thus ;
Put x = 15 in the equation ;
y = -2(15)^2 + 40(15) + 8
y = - 2 * 225 + 600 + 8
y = - 450 + 600 + 8
y = 158
158 cases
Answer:
5x^-3x-36/x-3
Step-by-step explanation:
Answer:
12 hours
Step-by-step explanation:
Create a proportion where x is how long the 21 cm candle can burn for:
= 
Cross multiply and solve for x:
14x = 168
x = 12
So, the 21 cm tall candle can burn for 12 hours
Before Tax Price: $81.00
Sale Tax: 5.50% or $4.46
Final Price: <span>$85.46</span>
Answer: This is a quadratic equation in x and can be solved using the quadratic formula: x = (-b +_ (b^2 - 4 ac)^1/2) / (2 * a)
or (-7 +- (49 - (4 * 2 * 6))^1/2) / (2 * 2) where a=2, b=7, and c=6
and x = (-7 +- (49 - 48)^1/2) / 4 = (-7 +- 1) / 4
giving x = -8/4 and -6/4 or -2 and =3/2