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PRE- ALGEBRA: Chapter 3 Test - Ans wer Key

1.    Translale ihe phrase inlo a mathematical expression involving the given variable: 7 times the sum of Ihc

numbcr n and 6.    7 fn + 6)_

F.valuatc łhc exprcssions.

3. -4x³ ♦ 2y^; where x 4 y (-3) -4<4)³ 4- (2)(-3)^J -4(16)-f (2)(9)

-64 + 18

2.    ^ ^ whcre a - 5, b (-6), c • 4, d - (-8)

(5) ♦ (-6)

•40 +(+24)

4. A bali is łhrown vertically upward. Ils vclocity afler t scconds following ils relcasc is glven by the

formula v = v_g~ jł, where v_a Ls the initial vc!ocity, # is acceleration due to gravity, and V is the velocity of the bali at the time /. The acceleration due to gravity is 32 "/««, and the initial velocity is 362 find the speed of the bali after l - 5 seconds.

v = v₀-gt v = 562 - (32)(5) v = 562 -160 v = 402 c

5.    a • b - b • a is demonstrating the_commutatiye_property.

Simplify the exprcssions.

6.    -3 (5a + 4)    7. -<-4xł7y-5)

-15a + (-12)    4x + (-7y) + 5

8. Identify the term. coefficient, and variable parts of -14x' + 6xy - 5y^ł + 7

Term	Coefficient	Variable Part
-14x^3	-14	X^3
6xy	6	xy
-5y'	-5	y*
7	7

Pre-Algebra: Chapter 3 Test - Ans wer Key 19