Let’s use y as a replacement for a number. You would do 3y-7 since you multiply by three and take away seven.
Answer: LAST OPTION.
Step-by-step explanation:
In order to solve for the variable "x" from the expression 
, you need to follow these steps:
1) You need to multiply both sides of the equation by 3:
2) You need to multiply both sides of the equation by 6:
3) Finally, you can divide both sides of the equation by 15:
P(allergic) = 0.15
P(both are allergic to pollen) = (0.15)² = 0.0225 (you can use the binomial probability also)
Q(NOT allergic to pollen) = 1 - 0.0225 = 0.9775
Binomial probability
Probability of NEITHER is allergic
ⁿCₓ(p)ˣ(q)ⁿ⁻ˣ
²C₀(0.15)⁰(0.9775)² = 0.9555
P(at LEAST ONE is allergic) = 1- 0.9555 = 0.0444
The arithmetic formula is expressed as an = a1 + d *(n-1)where n is an integer. Substituting from the given a1 = -12 and a27 = 66, 66 = -12 + d *(27-1). hence , d is equal to 3. a42 thus using the formula is equal to 111. The final answer to this problem is 111.
