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malfutka [58]
3 years ago
5

23 - (2 + 4) - 15 ÷ 3

Mathematics
2 answers:
liubo4ka [24]3 years ago
6 0

Answer:

12

Step-by-step explanation:

23 - (2 + 4) - 15/3

23 - (6) - 5

23 - 6 - 5

12

sergey [27]3 years ago
6 0

Answer:

12

Step-by-step explanation:

Use Order of Operations, or PEMDAS to find the order at which to solve this problem:

P - Parenthesis

E - Exponents

M - Multiplication

D - Division

A - Addition

S - Subtraction

Step 1: Solve inside the parenthesis

23-(6)-15÷3

Step 2: Complete the division

23-(6)-5

Step 3: Solve the subtraction

<u>12</u>

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2[18-(5+9)÷7]<br>show how you did it
Alex777 [14]
Order of operations

PEMDAS
do parntheases
then exponents
then mutiply or divide, whichever coms first
then addd or subtract, whichever comes first

so

when doing parenthases, simplify innermost parenthsees first

so

2(18-(5+9)/7)
innermost is (5+9)=14

now we gots
2(18-(14)/7)
we can distribute or multiply the invisible -1 in front of the 14

2(18-14/7)
now divide because division comes before adition
remember that it is -14/7, not just 14/7 because the negative is part of the 14

2(18-2)

now simplify parenthasees
18-2=16
so

2(16)
multiply
32

the result is 32
5 0
4 years ago
the production cost to make 10 shirts is modeled by the expression 1.8 y +5.5 where y represents the number of meters of fabric
alekssr [168]

Answer: 1.8y+0.55

Step-by-step explanation:

I took the test

4 0
3 years ago
Please help??? thanks!!!
Burka [1]
I believe its d because you subtract (-3 -7 1 9) from both sides
7 0
3 years ago
the perimeter of a rectangle can be found by using the formula P=21+2w. What is the width of the rectangle if the perimeter is 1
mixas84 [53]
\begin{gathered} P=2l+2w \\ \text{If l=50 and P=100, then:} \\ 100=2(50)+2w\Rightarrow0=2w\text{ !!!!} \end{gathered}

Since this can't happen, let's suppose that P=150, then:

\begin{gathered} P=2l+2w \\ \Rightarrow150=2(50)+2w \\ \Rightarrow150=100+2w \end{gathered}

Now we have to move the 100 to the other side of the equation with a negative sign to get this:

\begin{gathered} 150=100+2w \\ \Rightarrow150-100=2w \\ \Rightarrow50=2w \end{gathered}

Finally, to get w, we move the 2 that's multiplying to the other side dividing the 50:

\begin{gathered} 50=2w \\ \Rightarrow\frac{50}{2}=w \\ \Rightarrow w=25 \end{gathered}

Therefore, the width of the rectangle would be 25 ft if the perimeter is 150ft, and we can see how the rectangle would look:

6 0
2 years ago
If µ = 400 and s = 100 the probability of selecting at random a score less than or equal to 370 equals ____.
Alja [10]
You'll need to calculate the applicable z-score:
        (given value of x) - (mean value)
z = -----------------------------------------------
                standard deviation

                  370-400            -30
Here, z = ---------------  =  ---------- = -0.3
                      100                100

Use either a table of z scores or your calculator to determine the area under the standard normal curve to the left of z = -0.3.

According to my TI-83 Plus calculator, this area is 0.382.

The probability of selecting at random a score less than or equal to 370 is 0.382.
3 0
4 years ago
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