TEAS7 - Maths

Which of the following equation is a direct proportion?

A. y = x-5

B. y = 3x-5

C. y = 3x

D. y = 5

C. y = 3x

What is the first step of finding median?

List out data in ascending order (from smallest to largest)

Then, find the middle amount, if there’s even no. of data then get the average value of the middle two no.

A car salesperson earns $900 each month plus 6% commission on her monthly car sales. If she sells $58,000 worth of cars this month, what is her total salary of this month?

$4380

Jayden wants to use square pavers that are 4 inches on each side to completely surround the garden. The garden is 8 ft. long and 2 ft. wide. How many pavers should Jayden buy?

Find the perimeters and don’t forget the 4 corners to make 一圈

8 × 12 and 2 × 12 (convert ft to in)

Rate of change

(New no. - old no.)/ Time

Same as slope!

m = y2-y1/x2-x1

-2x > 10

x < -5

In a bio class, the ratio of male to female students is 3:5, What percentage of the class is male?

37.5%

What is “bivariate” for describing a graph?

containing two variables

Two similar triangles have side ratio of 3:5. What is the ratio of their area?

9:25

For similar shapes:

• Side ratio: (a:b)

• Perimeter ratio: (a:b)

• Area ratio: (a^²:b^²)

• Volume ratio (similar 3D solids): (a³:b³)

Memory trick:

• Length = power of 1

• Area = power of 2

• Volume = power of 3

.

In a library, 3/5 of the books are fiction, and the rest are nonfiction. There are 720 more fiction books than nonfiction. How many books are in the library?

3,600 books.

Let x be the no. of nonfiction.

2/3 = x/ (720+x)

x+ 720+x = 3,600 (yiu add back ALL)

Alice can paint a fence in 5 hours, and Charlie can paint the same fence in 7 hours. How long would it take if they painted the fence together?

Find the rate of works for each person first.

Alice =1/5; Charlie 1/7

Two workers can complete a job together in 6 hours. One worker can complete the job alone in 9 hours. How long would it take the second worker to complete the job alone?

18 hours.

Unimodal vs Bimodal

unimodal - a disturbution with only single peak.

Bimodal have two clear peaks

True of false: "The more I cough, the less likely I can run at a fast pace." is an example of direct variation, negative covariance.

False. It’s a inverse (non-direct) variation

A. mean

B. median

C. mode

D. range