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3 years ago

6

In math, where this whole PEMDAS thing come from? When I was in school, I was taught to do an equation from left to right, just

like you're reading a book.

1 answer:

Lapatulllka [165]3 years ago

4 0

PEMDAS means Parentheses Exponents Multiplication Division Addition Subtraction it's just an easy way to remember

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The lifespan of a guinea pig is 8 years shorter than the lifespan of a puma. Write a subtraction equation that you could use to

KiRa [710]

Answer: p-8

Step-by-step explanation:first thins problem is impossible without knowing the lifespan of a puma. But if you knew it oh let’s say it was 20 you would subtract the puma by 8.

7 0

3 years ago

Mary went up the Old Tower taking 3 steps per second. Then she carefully came down from the tower taking 2 steps per second. It

Inessa [10]

Answer:

old town has 150 steps

Step-by-step explanation:

Let the number of steps in the old tower be m

Mathematically, time = distance/speed

In this case, the distance is the number of steps while the speed is the rate of climbing or descending

For climbing, time spent = m/3

For descending time spent = m/2

Since it took her 25 longer when descending;

This means that;

m/2 - m/3 = 25

(3m-2m)/6 = 25

m/6 = 25

m = 6 * 25

m = 150 steps

8 0

3 years ago

Mrs. Smith's class is working on a variety of science experiments. Each

SVETLANKA909090 [29]

Answer:

66

Step-by-step explanation:

If there are <em>n</em> students, then the number of pairs is $\frac{n(n-1)}{2}$ .

With 12 students, $\frac{12(12-1)}{2} = \frac{132}{2}=66$ pairs can be formed.

The reason the formula works is this: Each of the 12 students can be paired with 11 other students (no student is paired with him/her self). But counting 12 x 11 = 132 counts each pair <u>twice</u>. Example: student A can be paired with student B,..., student B can be paired with student A. The pair was counted two times.

See the attached image that shows pairings of 5 students. There are

5(5 - 1)/2 = 5(4)/2 = 10 pairs.

8 0

3 years ago

A fruit company delivers its fruit in two types of boxes: large and small. A delivery of

Tema [17]

Answer:

Small box weighs 13.75 kg & large box weighs 15.75 kg

Step-by-step explanation:

We can write 2 simultaneous equation and solve for weight of each box.

<em>Let weight of large box be l and small box be s.</em>

<em />

"<u>3 large boxes and 5 small boxes has a total weight of 116 kilograms</u>":

$3l+5s=116$

and

"<u>9 large boxes and 7 small boxes has a total weight of 238 kilograms</u>":

$9l+7s=238$

<em>Now we can solve for l in the 1st equation and put it into 2nd equation and get s:</em>

<em> $3l+5s=116\\3l=116-5s\\l=\frac{116-5s}{3}$ </em>

<em>now,</em>

<em> $9l+7s=238\\9(\frac{116-5s}{3})+7s=238\\3(116-5s)+7s=238\\348-15s+7s=238\\348-238=15s-7s\\110=8s\\s=\frac{110}{8}=13.75$ </em>

<em />

<em>now we plug in 13.75 into s into equation of l to find s:</em>

<em> $l=\frac{116-5s}{3}\\l=\frac{116-5(13.75)}{3}\\l=15.75$ </em>

5 0

3 years ago

Find the midpoint of the segment with the following endpoints.<br> (-3,6) and (3,0)

Tresset [83]

Answer

(-3, 3)

Step-by-Step

-3-3/2=-6/2= -3
6-0/2= 6/2 = 3

(-3,3)

4 0

3 years ago