Answer:
y = 10
Step-by-step explanation:
Given y varies jointly as x and z then the equation relating them is
y = kxz ← k is the constant of variation
To find k use the condition y = 20 when x = 4 and z = 3 , then
20 = k × 4 × 3 = 12k ( divide both sides by 12 )
= k , that is
k = 
y = xz ← equation of variation
When x = 2 and z = 3 , then
y = × 2 × 3 = 5 × 2 = 10
Answer:
because the density or mass of the object doesn't change
56.70 because 35%of $42 is 14.70 and if you add those two together you get 56.70
Answer:
(-∞, 5 U 7 , ∞)
Step-by-step explanation:
Given the inequality expressions
d – 4 > 3 or d – 4 < 1
For d - 4 > 3
Add 4 to both sides
d-4 + 4 > 3 + 4
d > 7
7 < d
this means that d is greater than 7,
(7 , ∞)
For d - 4 < 1
Add 4 to both sides
d - 4 + 4 < 1 + 4
d < 5
This means d is less than 5
(-∞, 5)
The required solution is (-∞, 5 U 7 , ∞)
Answer:
x = 4
y = 3
Step-by-step explanation:
x = 10 - 2 y
substitute x = 10 - 2y into 2x - y = 5
20- 5y = 5
then
y = 3
and
x = 4
Mark brainliest
