14. Ten years ago.
A 10-X
B. 10+x
C. X-10
D. x+10y
15. A number decreased by seven
A. 74%
B.7-X
C.x-7
D. 10X-3x
16 8 subtracted from b.
A. 8-b
B. b+8
C. 10b-4b
D. 6-8
17. One-fourth of m
A. 4m
B. 1/4m
C. m/4
D. 4m/4
18. r increased by six
AR
В. Зr + Зr
Corto
D. 6
19. The ratio of 8 and d.
A. 8/d
B. d/8
C. 8d: d
D. 8d/4
20 The square of thrice a number y.
B.3x
A. 3x
C. (3x)
D. 3+x?​