20 is what percent of 80? Choose the equation to solve the problem a. 20 = 80% ∙ x; 25%

b. 80 = 20% ∙ x; 400%

c. 20 = x ∙ 80; 25%

d. x = 20% ∙ 80; 0.25%

answer: b

step-by-step explanation:

answer: 8 years

step-by-step explanation:

the explanation is that in 8 years the child will be 20 and in 8 years the father will be 40 and 20 is half of 40.

3.07*10^-4

move the decimal 4 places to the left

.000307

b: y = 2x + 2

step-by-step explanation:

y = 2x + 1

we want a line that is parallel, so it will have the same slope

the line is in the form y= mx+b, so the slope is 2

we have a slope and the y intercept (0,2)

since x is 0 we know the y point which is the y intercept

we can use y= mx+b to write the equation of the line

m is the slope and b is the y intercept

y = 2x +2