Answer:
d)
true
Step-by-step explanation:
- x - 4y = - 10
x + 4y - 10 = 0
a)
3 + 4×2 - 10 = 0
3 + 8 - 10 = 0
11 - 10 ≠ 0 (false)
b)
- 3 + 4×3 - 10 = 0
12 - 3 - 10 = 0
12 - 13 ≠ 0 (false)
c)
false
d)
true
The answer is x = 6
Let us first define x to be the number of hours of riding lessons she can take.
X = Hours of lessons
Now, she has $200, she needs to pay $20 for grooming supplies, and the lessons cost $30 an hour. We to find the maximum amount of hours of lessons she can take, so in other words, we want to make her broke. To do this, we first convert the words into an equation:
200 - 20 - 30x = 0
Simplifying, we get
180 = 30x
x=6
Answer:
123.75 g
Step-by-step explanation:
You have three unknowns: protein (p), carbohydrate (c), and fat (f)
You need three equations for the three unknowns. They are
(1) p + c + f = 725
(2) 4p + 4c + 9f = 3500
(3) 4p + 9f = 0.45(3500) = 1575
Subtract (3) from (2)
4c = 1925
(4) c = 481.25
Substitute (4) into (1)
p + 481.25 + f = 725
(5) p + f = 243.75
Multiply (5) by 4
(6) 4p + 4f = 975
Subtract (6) from (3)
5f = 600
(7) f = 120
Substitute (7) into (3)
4p + 1080 = 1575
4p = 495
p = 123.75
The diet will include 123.75 g of protein.
Check:
It checks.
700 rounded is just 700 since there’s no decimal and it’s a whole number it would stay 700 :)