Answer:
1. Benny had 266 dollars to spend on 9 books. After buying them, he had 14 dollars. How much did each book cost?
The books cost $28 dollars each.
<em>how to calculate...</em>
<em>
$266 - $14 = $252
</em>
<em>
then take $252 divided by 9 = $ 28</em>
<em />
2. Oceanside Bike Rental Shop charges 14 dolars plus 9 dollars an hour for renting a bike. Sally paid 86 dollars to rent a bike. How many hours did she pay to have the bike checked out?
8 hours
how to calculate...
take 86 - 14 = 72
then 72 divided 9 = 8 hours
3. The sum of three consecutive numbers is 132. What is the smallest of the three numbers?
43 is the smallest of the 3 numbers
<em>calculation...</em>
<em>x + (x+1) + (x+2) = 132</em>
<em>3x + 3 = 132 -3</em>
<em>3x=129
</em>
<em>x=129/3
</em>
<em>
x=43 (answer for the 1st number)</em>
<em>43+1=44 (answer for the 2nd number)</em>
<em>43+2=45 (answer for the 3rd number)</em>
add them all to make sure they equal to 132
<em>43+44+45=132
</em>
<em>132=132</em>
4. Sandy sold half of her comic books and then bought 8 more. She now has 16. How many did she begin with?
x= how many Sandy started with
<em>1/2 x + 8 = 16</em>
<em>1/2x = 16 - 8</em>
<em>1/2x = 8 * 2</em>
x = 16 comics books
Step-by-step explanation:
Answer:
x < -2
Step-by-step explanation:
subtract 6 from each side
-3x > 6
divide both sides by -3
x < -2
(with inequalities you must flip the sign if you divide by a negative number)
The first one would be D, and the second one, the question doesn't make sense. Can u show us full question.
Answer:
x= -2 or x= 8
Step-by-step explanation:
First step, move 25 to the left side so we can do the Quadratic Formula (or you can factor instead.)
Next, we know that 9-25 equals -16.
Now find that what two numbers multiply and get 16: 2×8 4×4 and 16×1.
Now we do some kind of factoring. The most valuable number must be negative since -6x is negative.
Let's explain about factoring in Quadratic a little bit.
Substitue x²-6x-16 as ax²+bx+c=0
From (ax+d)(bx+c), if we multiply ax and bx, we get the ax²
If we multiply ax and c, we get acx and we multiply d and bx, we get dbx. (axc+bdx) = bx
If we multiply d and c, we get c.
From the factor lf 16, 2×8 seems to be right since -8+2 equals -6 which matches the equation.
Then we get.
Seperate both equations.
Find the value of both x.
The answer is x = -2, 8
(The explanation might be weird since I don't know what they are called in English.)
I think the it would be some like y-8
