7x + 6y = 21 ⇒ 7x + 6y = 21
1x + 3y = -12 ⇒ 2x + 6y = -24
5x = 45
5 5
x = 9
x + 3y = -12
9 + 3y = -12
- 9 - 9
3y = -21
3 3
y = -7
(x, y) = (9, -7)
Answer: 8. Tens:4 Hundreds:5 Thousands:7
9. Tens:9 Hundreds:9 Thousands:9
10.Tenths:6 Hundredths:2 Thousandths:4
11. Tenths:7 Hundredths:3 Thousandths:6
Step-by-step explanation:
Answer:
29 3/4
Step-by-step explanation:
Answer:<CDA≈ 47.5 degrees
Step-by-step explanation:
I note M , so BM _|_ AD
in trg ABM, T Pitagora
AM^2=AB^2-BM^2
AM^2=6.5^2-6^2
AM^2=42.25-36
AM^2=6.25
AM=2.5
I note N , so CN_|_ AD
AD=AM+MN+ND
23=2.5+9+ND
23=11.5+ND
ND=23-11.5
ND=11.5
in trg CND
tg <CDA=CN/ND
=6/11.5
=1.(09)
so <CDA≈ 47.5 degrees
