Non-persistent HTTP and Persistent HTTP

i appologize if this is the wrong forum for this , but i have no idea were else to ask this.

im trying to understand this question from my text book

Suppose within your Web browser you click on a link to obtain a Web page, and the Web page is consisting of one HTML text with eight referenced objects. Let RTT0 denote the RTT between the local host and the server containing the object, the link transmission bandwidth is R, and the HTML text file size is L0 and the reference objects have a size of L1, L2, L3, …, L8, respectively. How much time elapses from when the client clicks on the link until the client receives the object in the following scenarios? a. Non-persistent HTTP with no parallel TCP connections? b. Non-persistent HTTP with the browser configured for 9 parallel connections? i think i understand but i have no way of checking my answers lol. can anyone help me out and make sure im doin this right please?

a. well for this one . since theres 8 objects, and RTT is 2RTT for non persistent , i got 8*2RTT= 16RTT+ lo/R

b. for this one , parallel connection means that all 9 are running at the same time. so doent this mean that the RTT would be just 1RTT? so RTT+Lo/R

also im not sure if you add the transmission time is added only once or once for each RTT