PARCC Grade 8 Math 2

Question 1

Which number is irrational?

Accepted Answer

√7

Answer

√7 cannot be written as a ratio of integers, so it is irrational.

Question 2

Solve for x: 5x - 3 = 2x + 12.

Accepted Answer

x = 5

Answer

Subtracting 2x and adding 3 gives 3x = 15, so x = 5.

Question 3

What is the value of 2^3 × 2^4?

Accepted Answer

2^7

Answer

Multiplying powers with the same base means adding exponents: 3 + 4 = 7.

Question 4

A line passes through (0, 2) with slope 3. What is its equation?

Accepted Answer

y = 3x + 2

Answer

Slope-intercept form y = mx + b gives y = 3x + 2.

Question 5

If two angles of a triangle measure 45° and 65°, what is the third angle?

Accepted Answer

70°

Answer

Angles in a triangle sum to 180°, so 180 - 45 - 65 = 70°.

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