Barbara is planning a party . she invited some school friends and 2 times as many friends from her swimming club as school friends . if a total of 21 friends came to her party , how many school friends did she invite

7 School Friends

Step-by-step explanation:

Make a Variable

SWM = swimming club

SCH = school

if 21 people are at her party, then that means the ratio of SCH:SWM is 1:2

21/3 = 7

that means 7 school friends were invited

have a great day!

answer: (c) m∠qpo + (2x + 16)° = 180°

step-by-step explanation:

the opposite angles of a quadrilateral are supplementary.

so, ∠o + ∠q = 180°   and   ∠p + ∠r = 180°

since ∠r = 2x + 16°, we can use substitution as follows:

∠p + ∠r = 180°

∠p + (2x + 16)° = 180°