Wynonna Errors

Question 1

What is the percent greater than formula?

Answer 1

Final value = (1 + x/100) initial value

Question 2

How do you find the total number of sides in a regular polygon?

Answer 2

((n-2)180) / n = interior angle
(n-2)180 = sum of interior angles
(n-2)*180 = interior angle * n

Question 3

In a component price mixture, what is the matrix format?

Answer 3

Component // Unit Price // Total Price

Question 4

Translate into an equation:

On Tuesday, 20% of all orders were for grilled tomatoes vs fried mushrooms.

Answer 4

2/8=G/F

Question 5

What is the formula for the area of a uniform trim that surrounds a circle?

Answer 5

pi*(r2^2 - r1^2)

Where r2 is the radius of the outer circle and r1 is the radius of the inner circle

Question 6

Put this in a formula:

If John had sold his car for $2400 last year, he would have made a 60% profit

Answer 6

Final amount = initial amount (1 + x/100)
2,400= initial amount ( 1+ 60/100)

Question 7

Put this in a formula:

If John had sold his car for $1200 last year, he would have made a 20% loss

Answer 7

Initial amount (1 - 20/100) = final amount
Initial amount (1 - 20/100) = 1200

Question 8

When asked to solve a ratio problem where there are multiple units, convert the ratios into the units that you are trying to solve for.

Answer 8

E.g. when asked to solve how many 16 ounce cans are needed, take the total ounces and divide by the no. of ounces per can.

Question 9

Given two quadrilaterals with the same perimeter, which one will have the bigger area? The square or the rectangle?

Answer 9

The square will always have the maximum area

Question 10

What is the formula for the surface area of a right circular cylinder?

Answer 10

2pi*r (r+h)

Question 11

When an equilateral triangle is split in 2, what is the result?

Answer 11

2 30-60-90 triangles with side proportions of x, root3*x, 2x

Question 12

What is the sum of the exterior angles of any polygon?

Answer 12

360 (make sure you are only adding 1 exterior angle per vertex)

Question 13

What is the permutation formula?

Answer 13

nPr= n! / (n-r)!

Question 14

What is the formula for P(x or y) when x and y are not mutually exclusive?

How about when the are mutually exclusive?

Answer 14

P(x or y)= P(x) + P(y) - P(x and y)

P(x or y)= P(x) + P(y)

Question 15

What is the area of a trapezoid?

Answer 15

(a+b)h / 2

Question 16

What are the components of a wet mixture problem?

Answer 16

1) concentration of components
2) amount of components
3) total amount of concentrate

Question 17

The product of n consecutive even integers will always be divisible by what?

Answer 17

2^n * n!

Question 18

What is the exponential decay formula?

Answer 18

Initial amount *(1+r)^t

Question 19

In similar triangle, what properties must you know?

Answer 19

1) ratio of sides will be the same
2) ratio of the areas will equal the ratios of the squares of the sides

Question 20

Sum of the first “n” natural numbers

Answer 20

N(N+1)/2

Question 21

Sum of the first n odd numbers

Answer 21

N^2

Question 22

Sum of the first n even numbers

Answer 22

n(n+1)

Question 23

What is 0.1^3?

Answer 23

0.001

Question 24

What is 1/10 percent of 5000?

Answer 24

1/(10*100) * 5000 = 1/1000 * 5000 = 5

Question 25

If each year for 4 years, a farmer increased the number of trees in an orchard by 1/4 of the number of trees in the orchard in the preceding year… what if the formula for the number of trees at the end of the 4 year period?

Answer 25

(5/4)^4 * x =

Where x is the number of trees at the beginning of the 4 year period

Question 26

What is 12*7?

Answer 26

84

Question 27

When positive integer x is divided by y,
The remainder is 9. If x/y = 96.12, what is the value of y?

Answer 27

Remainder/y = .12
9/y= .12
Y=900/12

Question 28

For quadratic equation ax^2+bx+c… what is the sum of the roots and product of the roots?

Answer 28

Sum=-b/a
Product=c/a

Question 29

Which is greater:
1) sqrt(x) + sqrt(y)
2) sqrt(x+y)

Answer 29

1) sqrt(x) + sqrt(y) is always greater unless both or either x and y are 0, in which case they are equal.

Question 30

Any positive integer root from a number more than 1 will be what?

Answer 30

More than 1