教えて下さい！

【カしてください

（1）の問題の解き方が分かりません。 一応、解説はついているのですが理解できません 回答よろしくお願いします🙇🏻‍♂️ 解答も貼っておきます。

明治時代　桂太郎らの対露強硬論と日英同盟論は一緒ですか？

how

The price of a particular share varies from day to day. On Monday the price of the share wasE1.Tuesday's price was 209% higher than Monday'S, and Thursday's price was 25% up on Wednesday's price. By the Friday of that week the price had returned to ま1. Helen bought 1000 worth of this share on Monday and then sold 1hem on Thursday to make a profit of ま350. Paul bought 3000 worh of this share on Tuesday, but had to sell them the following day. Assuming that there are negligible costs associated with buying and selling these shares, what was the retum on Paul's investment?

How? 😭

equation for the complete combustion of methane iS: CH4⑧+20(8) っCOz(⑧+2Hz0⑧@ 0 of methane Were completely bumed in 8.00g of oxygen (an exCeSS) to produce 4.40g dioxide、What mass of oxygen is left unreacted? 1:C=12:O=16)

How

(3 car is being driven at 20m/s when the driver sees a child run into the road. The drivers usual reaction time is 0.70s, but this is doubled because the driver is tired. Once the driver applies the brakesthe car is brought uniformly to rest in a further 3.3s. What is the total distance travelled by the car between when the driver first sees the child to when th car StopS?. A 33m B 40m 40 mnら 039く *して うりの

How?

15 1 @)ww Of the following have the same electron arrangement?. 外 36C 40. 3 40Ca+ 人Cl 37CI 19AT 38K+ 20Ca 交*, 3 an 38r oy 幸CL ,拉CT and 39ca ony 恋, 94r and 38KY ony 至CT 9Ar and 43K- only 38caT,提Ar and 33K-ony 41Kー K

how to get that?

(20 )A clsss of pupie takes a speling tesL Thelr mean score for the test is mr Anoiher PuPH TekeS the test and scores n. When this pupil's result is included with the other results it is found tht the mean has decreased by 2. Which equation below gives the correct expression for r in terms of 7 7 A 2二 B ーー 如一3 2 世一3 7ー2 ァニーーー 3 芝填2 カルニーーー 直一1 如 ォ=ニー で し 加十2 、れ=ーテ=ー

Explain please

⑯) Te Hagrmm shows the oniy four forees actng on a model airraf ormass 2.0kg whili fying. lfomwings 25N air resistance force from ーートーでコーウー ょeeen weight 20N Which line in the table states the horizontal and vertical accelerations of the aircraft at this Verdca/ accelera(o0 2.5m/supwards 10m/s?downmwards 10m/s?downwards

Explain please

an isosceles triangle in which PO = PR = 6cm and 0R = 8cm. e of the tangent of angle POR?