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4 years ago

8 less than the product 8 and -4

Mathematics

1 answer:

sesenic [268]4 years ago

7 0

Answer: The answer should be -40.

Step-by-step explanation: A product is the result of multiplication and in cases like this, "less than" points to the mathematical operation of subtraction.

So when you see product, you automatically know the problem deals with <em>multiplication</em>. When you see less than, you automatically know the problem deals with <em>subtraction</em>.

The translation of this problem is 8 · -4 = x, then x - 8 = a (aka the answer).

First step is to find x, then to find a.

Note that a positive times a negative will give you negative. 8 times 4 is 32, but since 4 is a negative number here, the answer would be -32.

From this we can conclude that x is -32.

8 · -4 = -32, then -32 - 8 = a

Final step is to find a, which would be the result of -32 - 8.

-32 - 8 is -40 (Note: a negative minus a positive is basically addition in negatives. For instance, if we did -2 - 2, it'll give us -4.).

a = -40

Your answer is -40.

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An orchard has 651 orange trees. The number of rows exceeds the number of trees per row by 10. How many trees are there in a row

natima [27]

Answer:

The number of trees in each row is 21.

Step-by-step explanation:

Let us assume the number of trees in each row = m

So, the number of rows in the orchard = Number of trees in each row + 10

or, total number of trees in each row = (10 +m)

Now, Total number of Trees = Number of Rows x Number of trees in 1 row

⇒ 651 = m (m + 10)

$651 = m^2 + 10m\\\implies m^2 + 10m - 651 =0\\or, m^2 + 31m 21m - 651 =0\\or, m(m +31) -21(m+31) =0\\\implies (m +31) (m-21) = 0$

⇒ (m +31) = 0, or (m-21) = 0

⇒ m= -31, or m = 21

Now, as m = The number of trees in each row, so m ≠ -31

So, m = 21

Hence, the number of trees in each row is m = 21.

8 0

4 years ago

Evaluate the expression when r = 3.<br> 15r

Liula [17]

Answer:

Step-by-step explanation:

Because if you replace the r with 3, it would be 15(3).

15(3) is the same as 15 × 3.

15 × 3 = 45

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8 0

3 years ago

Find the values of x and y

const2013 [10]

Answer:

x = 79 y = 22

Step-by-step explanation:

x would be the same as the other side so 79 * 2 would be 158. A whole triangle is 180. 180 - 158 = 22

7 0

3 years ago

The length of the rectangle is 4cm less than its width . what are the dimensions of the rectangle if its area is 140

melomori [17]

Let the width of the rectangle be x
Then length =x-4
Area=x(x-4)=140
x²-4x=140
x²-4x-140=0
x²-14x+10x-140=0
x(x-14)+10(x-14)=0
(x-14)(x+10)=0
Therefore,length=14 cm and width=10 cm

8 0

3 years ago

Simplify 5x(3x^2+2x-3)

Tcecarenko [31]

Answer:

$15x^3 +10x^2 - 15x$