PP test

[ivylin]

if n is a multiple of 5 and n=p^2q, where p and q are prime numbers, which of the following must be a multiple of 25?

a P^2
b q^2
c pq
d p^2*q^2
e p^3*q

answer is d

i don't understand the question...please help me

[吳]

if n is a multiple of 5 and n=p^2q, where p and q are prime numbers, which of the following must be a multiple of 25?

a P^2
b q^2
c pq
d p^2q^2
e p^3q

answer is d

請問是題目p^2*q or p^(2q)

p^2*q的話:
n=5k=p^2*q
=>p.q有一個要是5=>d符合

[ivylin]

in a certain state, gasoline stations compute the price per gallon p, in dollars, charged at the pump by adding a 4 percent sales tax to the dealer's price per gallon d, in dollars, and then adding a gasoline tax of $0.18 per gallon. which of the following gives the dealer's price per gallon d in terms of the price per gallon p chaged at the pump?

a. d=p-0.22
b d=p/1.22
c d=p/1.04-0.18
d d=(p-0.18)/1.04
e d=(p-0.04)/1.18

anser: d

this question i don't understand, too ^^

[吳]

in a certain state, gasoline stations compute the price per gallon p, in dollars, charged at the pump by adding a 4 percent sales tax to the dealer's price per gallon d, in dollars, and then adding a gasoline tax of $0.18 per gallon. which of the following gives the dealer's price per gallon d in terms of the price per gallon p chaged at the pump

以上可列出:
p=1.04d+0.18
在移項就好了

[ivylin]

thank you...^^

[yvetteliao]

if n is a multiple of 5 and n=p^2q, where p and q are prime numbers, which of the following must be a multiple of 25?

a P^2
b q^2
c pq
d p^2q^2
e p^3q

answer is d

請問是題目p^2*q or p^(2q)

p^2*q的話:
n=5k=p^2*q
=>p.q有一個要是5=>d符合

請問d符合是因為只有q會是5嗎
（n=p^2*q,則5n=p^2*q^2）
不然若p是5的話，n就會是25的倍數
就不符合答案的條件了
(n is a multiple of 5)

[Huang Hsin-Yi]

in a certain state, gasoline stations compute the price per gallon p, in dollars, charged at the pump by adding a 4 percent sales tax to the dealer's price per gallon d, in dollars, and then adding a gasoline tax of $0.18 per gallon. which of the following gives the dealer's price per gallon d in terms of the price per gallon p chaged at the pump

以上可列出:
p=1.04d+0.18
在移項就好了

這一長串文字化成這簡單的式子還真需要靠點聯想力
有誰可告訴我它在說什麼呀

[sunnyblue13s]

價錢P=(1+0.04銷售稅)*d採購價+0.18瓦斯稅