Answer: 21 dollars was his bill before the tip
Step-by-step explanation: 4.20 is 20% of what he paid with no tip included. This means you can set up an equation like this.
4.20 = .2x This means that $4.20 is (is means =) 20% of (of means multiply) x (which is the unknown factor).
Answer:
the first, second and fifth ones
Step-by-step explanation:
<u>Answer</u>
= -24
<u>Explanation</u>
The discriminant helps us determine the nature of the roots of a quadratic equation
When using the quadratic formula the find the roots of a quadratic equation, the term (b²-4ac) is known as the discriminant.
Where b ⇒ coefficient of the 2nd term
a ⇒ coefficient of the 1st term
c ⇒ the 3rd term.
In the equation 3x²-6x+5, the discriminant is;
(-6)² - (4×3×5) = 36 - 60
= -24
Answer:
Step-by-step explanation:
The trick here is to make sure that the units are standard units, like miles / hour.
10 minutes = 10 / 60 hours.
k = 1/6 of an hour
y = k x
k = y/x
k = 8 miles / 1/6 of an hour
k = 8 * 6 // 1/6 * 6
k = 48 miles / hr
y = k x
y = 48 * x
7 and 1/8 is greater than 7.025