MATHEMATICS
MIDDLE SCHOOL

12a-(4b+4a)-b

Answer: 12a-(4b+4a)-b

12a-4b-4a-b

=> 8a-5b

12a-4b-4a-b

=> 8a-5b

Answer:

Answer:

8a - 5b

Step-by-step explanation:

12a-(4b+4a)-b

= 12a - 4b - 4a - b

Combine like terms

= 8a - 5b

COLLEGE

Use substitution to solve the system.

3x-2y = 17

x = 3y+15

3x - 2y = 17

substitute x with 3y+15

3(3y+15) - 2y = 17

use the distributive property

9y + 45 - 2y = 17

combine like terms 9y and -2y

7y + 45 = 17

subtract 45 from both sides

7y = -28

divide both sides 7 to isolate the variable, y.

y = -4

To solve for x:

x = 3y + 15

plug in -4 for y

x = 3(-4) + 15

multiply

x = -12 + 15

add

x = 3

substitute x with 3y+15

3(3y+15) - 2y = 17

use the distributive property

9y + 45 - 2y = 17

combine like terms 9y and -2y

7y + 45 = 17

subtract 45 from both sides

7y = -28

divide both sides 7 to isolate the variable, y.

y = -4

To solve for x:

x = 3y + 15

plug in -4 for y

x = 3(-4) + 15

multiply

x = -12 + 15

add

x = 3

MIDDLE SCHOOL

Evaluate the following expression. NEED THE ANSWER ASAP!!!!!!!!!!!! (-6)-2

-36

-1/36

1/36

36

I think your answer will be -36

Answer:

C. 1/36

Step-by-step explanation:

HIGH SCHOOL

Simplify (2a^3) (5a^4)

Answer: 10

Step-by-step explanation: Think of this problem of having two parts. The coefficients 2 and 5 and the powers and . To multiply these two terms together, simply multiply their coefficients and we have to add the exponents because we are multiplying powers.

2 × 5 = 10

× =

Therefore, our answer is 10.

With this, you multiply the coefficients first, (2)(5)=10

Then when you multiply the variables, you add the exponents,

So you would end up with:

COLLEGE

Why are reliability and validity important for assessment? How are content validity and criterion-related validity used to establish construct validity? Support your position.

Answer:

They help in the determination of the appropriateness and meaningfulness of the assessment

Step-by-step explanation:

The content validity helps to ascertain if the facets of the constructs are covered in the construct while criterion-related validity helps to determine how one of the construct predict the outcome of another measure in the outcome.

suppose we are measuring sleep, if the test does measure sleep then we say the test has a content validity. in other word, when a student takes a GRE, we can say we have a criterion related validity because GRE is a good predictor of student's performance in Graduate school.