I just did it on paper but hope that helps:)
Draw 37 circles and then use / slashes and cross out 19 of those circles
A*5+b*2=145
a +b =50 | * -2
5a +2b=145
-2a -2b = -100
----------------------
5a-2a = 145-100
3a= 45
a=45:3
a=15 questions are worth 5 p
b=50-15=35 questions worth 2 p
Answer:
Step-by-step explanation:
–10.5 < 3a ⇒ -3.5 < a ⇒ a > -3.5
- <u>no</u> as variable has positive coefficient
b/6 ≤ 7 ⇒ b ≤ 42
- <u>no</u> as variable has positive coefficient
–4.5c > 9 ⇒ c < - 2
- <u>yes </u>as variable has negative coefficient
–21/5 ≤ –5/2d ⇒ (-21/5)*(-2/5) ≥ d ⇒ d ≤ 42/25
- <u>yes</u> as variable has negative coefficient
Answer:
<BCE=130°
Step-by-step explanation:
<BCE + <HCE=180° (Angles on a straight line)
<BCE+50°=180°
<BCE=180°-50°
<BCE=130°
