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2 years ago

Simplify the expression by combining like terms. 16+8−3+6−9

Mathematics

2 answers:

iragen [17]2 years ago

8 0

Answer:

Step-by-step explanation:

16+8−3+6−9 = (16+8+6) + (-3 -9)

= 30 + (-12)

= 18

If two numbers have opposite sign, subtract and put the bigger number sign for the result

NNADVOKAT [17]2 years ago

6 0

I believed the answer is 18

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A piggy bank contains a total of 84 coins in nickels and quarters worth $12.80.

Kitty [74]

Let's make a system of equations to solve for this:

n + q = 84

0.05n + 0.25q = 12.80

where n = nickels and q = quarters.

---

Solve for n in the first equation by subtracting q from both sides.

n = 84 - q

---

Plug n into the second equation.

0.05(84 - q) + 0.25q = 12.80

Distribute 0.05 inside the parentheses.

4.2 - 0.05q + 0.25q = 12.80

Combine like terms.

4.2 + 0.2q = 12.80

Subtract 4.2 from both sides.

0.2q = 8.6

Divide both sides by 0.2.

q = 43

---

Plug 43 for q in the first equation.

n + (43) = 84

Subtract 43 from both sides.

n = 41

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There are 41 nickels and 43 quarters in the piggy bank. ✅

8 0

2 years ago

What is the sum of the angles of a quadrilateral

posledela

A quadrilateral always has interior angles that add up to 360 degrees.

6 0

2 years ago

Read 2 more answers

Graph y equals 1/2 x - 3

Elis [28]

Answer:

Resulting plot in the image attached

Step-by-step explanation:

Start by making a table of (x,y) pairs that satisfy this equation. Notice that two pairs would be enough, but it is always safer to obtain at least three to see them actually "aligned".

We are trying to find values for y when x= 0, 2, and 4 to make our calculations simple:

$y=\frac{1}{2} x-3$

When x = 0 then: $y=\frac{1}{2} (0)-3=-3$ So we plot the value (0,-3) on the x-y plane.

When x = 2 then: $y=\frac{1}{2} (2)-3=1-3=-2$ So we plot the value (2,-2) on the x-y plane.

When x = 0 then: $y=\frac{1}{2} (4)-3=2-3=-1$ So we plot the value (4,-1) on the x-y plane.

Please see the points and the resulting line in the image attached

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2 years ago

Christianity has a messy house. The function that represent the total cost Christianity spends having house clean is c(v)

Reptile [31]

Answer:

The input in this equation is c(v), and the output is 125v. For example, if you input 2 into c(v) and get c(2), you will get 125(2) = 250 for two visits.

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3 years ago

Solve the system by substitution

kramer

Answer:

The solution to the system of equations be:

$x=3,\:y=-2$