By solving a system of equations we will see that Sandy has 20 nickels and 15 dimes.
We need to define the variables:
We know that there are 35 coins so:
x + y = 35
And the total values if $2.50, then:
x*$0.10 + y*$0.05 = $2.50
Then our system is:
x + y = 35
x*$0.10 + y*$0.05 = $2.50
To solve this, we need to isolate one of the variables in one of the equations. I will isolate x on the first equation:
x = 35 - y
Now we replace this on the other equation:
(35 - y)*$0.10 + y*$0.05 = $2.50
$3.5 - y*$0.05 = $2.50
$3.50 - $2.50 = y*$0.05
$1.00/$0.05 = y = 20
So there are 20 nickels and the other 15 coins are dimes.
If you want to learn more about systems of equations, you can read:
A. The range of F(x) is y > 4.
B. It is decreasing.
C. It is increasing.
D. The y-intercept is (0, 4).
E. The y-intercept is (0, 3).
F. The domain of F(x) is all real numbers.
The true statements for the given function F(x) = 3 * 4^x are: it is increasing, the y-intercept is (0, 3), and the domain of F(x) is all real numbers.
The function given is F(x) = 3 * 4^x. Let's check each statement given:
#SPJ11
Answer:
x=-4
Step-by-step explanation:
brainliest please
Answer:
x=-4, Give brainliest please
Step-by-step explanation:
Step 1: Add 8.4x to both sides.
2.1x+45.2 = -8.4x +3.2
+8.4x +8.4x
10.5x+45.2=3.2
Step 2: Subtract 45.2 from both sides.
10.5x + 45.2 = 3.2
-45.2 -45.2
10.5x=−42
Step 3: Divide both sides by 10.5.
=
x=−4
Answer:
The original price of the gift was $40.
Step-by-step explanation:
Let the original price of the gift be = x
Discount of 10% on the gift and each sister paid $9 means a total of dollars
We can write this information mathematically like :
Solving for x now;
x = $40
So, the original price of the gift was $40.