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Anni [7]
3 years ago
7

Evaluate the expression 7x2y, when x = 3 and y = 4. ^ The 2 is too the power of whatever x is.

Mathematics
2 answers:
alexandr402 [8]3 years ago
6 0
7x^2y \hbox{ when } x=3 \hbox{ and } y=4 \\ \Downarrow \\ 7 \times 3^2 \times 4=7 \times 9 \times 4=\boxed{252}
vredina [299]3 years ago
6 0

Answer:

The answer would be 252. I know this because I got it correct on my study guide.

Step-by-step explanation:

First I write down the problem like this...      7 (3) ² 4.

Since the # is in parenthesis I multiply 3 by the power of ² which equals to nine. (Remember, when I am multiplying 3 to the power of ² I do not multiply 3 times 2. I multiply 3 by itself 2 times. 3 x 3 = 9. I think you get the point.)

Now, you write it like this.... 7 x 9 x 4. All you have to do know is multiply. You can start anyway you like. If I multiply 9 x 4 first that equals 36. 36 x 7 gives me 252.

The same thing is the other way around. If I multiply 7 x 9 that equals 63. 63 x 4 also equals 252!

I hope this helped you. Please mark as Brainliest and let me know if I could help you with future questions. Have a Great Day Everyone!

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-4x - y = 24<br> Complete the missing value in the solution to the equation.<br> ( _,8)
Zinaida [17]

Answer:

(- 8, 8 )

Step-by-step explanation:

Given ( ?, 8 ) is a solution. To find x substitute y = 8 into the equation, then

- 4x - 8 = 24 ( add 8 to both sides )

- 4x = 32 ( divide both sides by - 4 )

x = - 8

Thus solution is (- 8, 8 )

5 0
3 years ago
The drawing plan for an art studio shows a rectangle that is 15.2 inches by 8 inches. The scale in the plan is 4 in.: 5 ft. Find
Kamila [148]

Answer:

Length: 19 feet

Width: 10 feet

Area: 190 feetx^{2}

Step-by-step explanation:

This is a question about ratio.

Length: let x be the actual length.

15.2 : x = 4 : 60

x = 19

Width: let y be the actual width.

8 : y = 4 : 60

y = 10

Area: A = xy

19 * 10 = 190

3 0
3 years ago
Im desperate like most of my question-
kvv77 [185]
<h3>Answer: 9.75 dollars</h3>

===========================================================

Explanation:

There are two ways to solve this problem.

Method 1:

35% = 35/100 = 0.35

35% of 15 = 0.35*15 = 5.25

So you save $5.25, which is the discount amount.

The sale price is 15 - 5.25 = 9.75 dollars

---------------

Method 2:

If you save 35%, then you still need to pay the remaining 65%

35% + 65% = 100%

The sale price is 65% of original price

sale price = 65% of original price

sale price = 0.65*15

sale price = 9.75 dollars

---------------

Extra info (optional section)

The benefit of method 2 is that we can chain multiple discounts together. Consider that on top of the 35% discount, the store then decides that members (people who pay monthly) will get an extra 10% off. The natural thinking is that the total discount is 35%+10% = 45% off, but that's not correct.

We can see this if we say that the original price is say $100 and 35% off would lead to a price of 0.65*100 = 65 dollars. Then an extra 10% off means we pay 90% of that new price (65 dollars) to get 0.90*65 = 58.50

As a shortcut, we can just multiply the values of 0.65*0.90 = 0.585

Then note how 100*0.585 = 58.50 showing us a fairly fast way to compute the final sale price even if multiple discounts are applied. This can be extended to more discounts. Again, we do not add the percentages when it comes to figuring out how much the total discount percentage would be.

Since the item was $100 but now it's 58.50, this means we saved 100-58.50 = 41.50 dollars. The discount is therefore 41.50/100 = 41.50% which is close to the 45% calculated earlier, but not quite there.

7 0
3 years ago
Read 2 more answers
An electric bill in May was $112.00. In June, the bill was $163.00. What is the percent of increase, rounded to the nearest tent
laila [671]

Answer:

d. 45.5%

Step-by-step explanation:


7 0
3 years ago
Please answer question #45 for me!!!
mel-nik [20]
Convert the mixed fractions into improper fractions and divide them to get them into decimals. Then see if pi is in between those numbers.

Ex: 2 3/4 = 11/4 = 2.75
3 0
3 years ago
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