Question

2. Geoff planted dahlias in his garden. Dahlias have bulbs that divide and reproduce underground. In the first year, Geoff’s garden produced 6 bulbs. In the second year, it produced 12 bulbs, and in the third year, it produced 24 bulbs. If this pattern continues, how many bulbs should Geoff expect in the eighth year? (1 point)
48 bulbs
384 bulbs
768 bulbs
1,536 bulbs

3. What are the first four terms of the sequence represented by the expression n(n – 1) – 5? (1 point)
–7, –5, –3, 1
–5, –10, –15, –20
0, 2, 6, 12
–5, –3, 1, 7

6. Given the function rule f(x) = x² – 5x + 1, what is the output of f(–3)? (1 point)
7
–5
25
5

7. Suppose you earn $10 each hour you babysit. Which function describes the relationship between your total earnings E and the number of hours you babysit, h? (1 point)
E(h) = 10h
E(h) = h + 10
E(h) = h – 10
h = 10E

Melanie charges $4.50 per hour when she washes cars, plus $5.00 for supplies. Which function rule represents the amount y Melanie charges to wash cars for x hours? (1 point)
y = 0.50x
y = 4.50x + 5.00
y = 5.00x + 4.50
y = 9.50x

14. The sale price of apples at a local grocery store is $1.35 for the first pound and $1.10 for each additional pound. Which function rule shows how the cost of apples, y, depends on the number of pounds, x? (1 point)
y = 1.10(x – 1) + 1.35
y = 1.10x + 1.35
y = 1.35x + 1.10
y = (1.10 + 1.35)x
PLEASE HELP

Answer 1

2. In the first year, Geoff’s garden produced 6 bulbs. In the second year, it produced 12=6·2 bulbs, and in the third year, it produced 24=12·2 bulbs. If this pattern continues, then he can expect 24·2=48 bulbs in the fourth year, 48·2=96 bulbs in the fifth year, 96·2=192 bulbs in the 6th year, 192·2=384 bulbs in the 7th year and 384·2=768 bulbs in the 8th year.

Answer 2: correct choice is C.

3. Given n(n – 1) – 5 you can find:

• for n=1, 1·(1-1)-5=-5;
• for n=2, 2·(2-1)-5=-3;
• for n=3, 3·(3-1)-5=1;
• for n=4, 4·(4-1)-5=7.

Answer 3: correct choice is D.

6. Given the function rule f(x) = x² – 5x + 1,

f(-3)=(-3)²-5·(-3)+1=9+15+1=25.

Answer 6: correct choice is C.

7. Suppose you earn $10 each hour you babysit and your total earnings E depending on the number of hours h you babysit is

E(h)=10·h.

Answer 7: correct choice is A.

8. If Melanie charges $4.50 per hour, then she she charges $4.50·x for x hours. Plus $5.00 for supplies, then the function rule is

y=4.50x+5.00.

Answer 8: correct choice is B.

14. The sale price of apples at a local grocery store is $1.35 for the first pound and $1.10 for each additional pound. If x is the number of sold pounds then 1 was sold for $1.35 and rest x-1 were sold for $1.10. This means that

y=1.10(x-1)+1.35

Answer 14: correct choice is A.