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grigory [225]
3 years ago
12

a textbook sold a combined total of 391 psychology and biology books in a week. the number of biology books sold was 71 less tha

n the number of psychology books. how many text books of each kind was sold. ​
Mathematics
1 answer:
Hunter-Best [27]3 years ago
7 0

Answer:

320

Step-by-step explanation:

I think you have to subtract the number and I think it will be 320

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Find the possible dimensions of the picture above please
Svetlanka [38]

Answer:

(2x – 7) × (2x + 7)

Step-by-step explanation:

From the question given above, the following data were obtained:

Area (A) = (4x² – 49) m²

Dimension =?

The picture in the question above has a rectangular shape. Thus, the area is given by:

Area (A) = Length (L) × Width (W)

A = L × W

The dimension of the shape will be:

L × W

Now, we shall determine the dimension (L × W) as follow:

Area (A) = (4x² – 49) m²

Dimension (L × W) =?

A = L × W

L × W = 4x² – 49

Recall:

4 = 2²

49 = 7²

Thus,

L × W = 2²x² – 7²

L × W = (2x)² – 7²

Different of two squares

L × W = (2x – 7)(2x + 7)

L × W = (2x – 7) × (2x + 7)

Dimension = (2x – 7) × (2x + 7)

Therefore, the possible dimension (L × W) of the shape is (2x – 7) × (2x + 7)

4 0
3 years ago
4/8 times 3/4 simplified pls and thank you
Ivahew [28]

Answer:

3/8

Step-by-step explanation:

divide out the 4's and you are left with 3/8

3 0
3 years ago
Sign numbers, ratios &amp; Proportion <br><br> (+10) + (+6) = ?
Viefleur [7K]

Answer:

16

Step-by-step explanation:

Putting a + in front of a number indicates that the number is positive. so we are just going to add it up.

10+6=16

10:6=5:3

Hope it helps:)

7 0
3 years ago
Read 2 more answers
Find the area of the trapezoids.
Serjik [45]

Answer:

Area of STAR is 12, Area of SKCO= 10.5

Step-by-step explanation:

7 0
3 years ago
One leg of a right triangle has length 7. The lengths of the other two sides are whole numbers. The length of the other leg is _
suter [353]
Sets of three integers that could be right triangles are called pythagorean triples. the only pythagorean triple including 7 is 7, 24, and 25. so the length of the other leg is 24 and the length of the hypotenuse is 25. hope this helped!
7 0
3 years ago
Read 2 more answers
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