New SAT Math Workbook

# Com literal expressions 9 4 express the number of

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: subtract. 6x + 9y = 21 6x – 4y = 8 13y = 13 y=1 6. (A) Multiply first equation by 3, second by 2, then add. 9x + 6y = 15a + 3b 8x – 6y = 2a + 14b 17x = 17a + 17b x=a+b 5. (D) 2x = 16 5 2x = 80 x = 40 Checking, 80 = 5 16 = 4, which is true. www.petersons.com 132 Chapter 8 7. (D) 4x2 + x = 0 x(4x + 1) = 0 x=0 1 x = 0 or – 4 4x + 1 = 0 8. (A) (x + 12)(x – 3) = 0 x + 12 = 0 x = –12 or +3 x2 + 3 = x + 1 x–3=0 9. (B) x2 + 3 = x2 + 2x + 1 3 = 2x + 1 2 = 2x x=1 Checking, 4 = 1 + 1, which is true. 10. (E) 2 x = –10 x = –5 x = 25 Checking, 2 25 = –10, which is not true. www.petersons.com Literal Expressions 9 4. Express the number of miles covered by a train in one hour if it covers r miles in h hours. (A) rh (B) (C) (D) (E) 5. h r r h DIAGNOSTIC TEST Directions: Work out each problem. Circle the letter that appears before your answer. Answers are at the end of the chapter. 1. If one book costs c dollars, what is the cost, in dollars, of m books? (A) (B) (C) (D) (E) 2. m+c m c c m mc mc 100 r+h r–h Represent the cost, in dollars, of k pounds of apples at c cents per pound. (A) kc (B) 100kc (C) (D) (E) kc 100 Express the number of minutes in h hours and m minutes. (A) mh (B) (C) (D) (E) h +m 60 60(h + m) h+m 60 100k + c k +c 100 60h + m 6. 3. If p pencils cost c cents, what is the cost of one pencil? (A) (B) (C) (D) (E) c p p c Express the number of seats in the school auditorium if there are r rows with s seats each and s rows with r seats each. (A) 2rs (B) 2r + 2s (C) rs + 2 (D) 2r + s (E) r + 2s pc p–c p+c 133 134 Chapter 9 7. How many dimes are there in n nickels and q quarters? (A) (B) (C) (D) (E) 10nq n+q 10 1 5 n+ q 2 2 9. 10n + 10q 2n + q 10 The cost of a long-distance telephone call is c cents for the first three minutes and m cents for each additional minute. Represent the price of a call lasting d minutes if d is more than 3. (A) c + md (B) c + md – 3m (C) c + md + 3m (D) c + 3md (E) cmd 8. Roger rents a car at a cost of D dollars per day plus c cents per mile. How many dollars must...
View Full Document

## This note was uploaded on 08/15/2010 for the course MATH a4d4 taught by Professor Colon during the Spring '10 term at Embry-Riddle FL/AZ.

Ask a homework question - tutors are online