10.5x + 3y = 811.5
x + y = 97
y = 97 - x
3y = 291 - 3x
7.5x + 291 = 811.5
7.5x = 811.5 - 291
x = 520.5 / 7.5
x = 69.4
69 were sold at the original price
Problems:
0.5x0.5 = 0.25
0.6x0.6 = 0.36
0.1x0.5 = 0.05
1.5x0.5 = 0.75
There are many problems like that. You can do 0.2, 0.3, 0.4, 0.5, etc. multiplying another integer.
Answer:
c
Step-by-step explanation:
When we know two sides and the included angle, there is a formula we can use.
We know angle C = 35º, and sides a = 20cm and b = 19.5cm.
using the formula
Area =(½)ab sin C(angle)
Put in the values we know:
(20×19.5÷2)×sin(35)=
111.8474050885 cm^2
rounded = 111.85 cm^2
answer is c
What? Where’s the question 11
