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Cloud [144]
3 years ago
9

How to factor 3n^2+3n-60

Mathematics
2 answers:
sveta [45]3 years ago
6 0
3n^2+3n-60 =\\
3(n^2+n-20)=\\
3(n^2+5n-4n-20)=\\
3(n(n+5)-4(n+5))=\\
3(n-4)(n+5)
Digiron [165]3 years ago
4 0
Factour out the 3 first
3(n^2+n-20)
what 2 numbers muliplty to get -20 and add to get 1
-4 and 5
3(n-4)(n+5)
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4 0
3 years ago
Craig has a building block in the shape of a rectangular pyramid. A net of which is shown below.
Alex787 [66]

Answer:

the answer is D: 294 sq. cm

Step-by-step explanation:

first you want to split the net into 4 triangles and 1 rectangle

a = 12 cm

b =  6 cm

d = 13 cm

calculate the surface area of the pyramid...

1st find the area of the rectangle base

Rectangle base area

b x a = (6 cm) (12 cm)

= 72 sq. cm

next find the area of the triangle on the left

Left triangle

1/2(b)(d) = 1/2 (6 cm)(13 cm)

= 1/2 (78 sq cm)

= 39 sq. cm

Since all the triangles are congruent (same), you will need to multiply by 2 to get the combined area of the triangle on the left and on the right.

Area of left & right triangles

= 2 (39 sq. cm)

= 78 sq. cm

Find the area of the triangle on the bottom

Bottom triangle area = 1/2 (a)(a)

= 1/2 (12 cm) (12 cm)

= 1/2 (144 sq. cm)

= 72 sq. cm

Since the bottom of the triangle is congruent to the top triangle, multiply that by 2 to get a combined area of the triangle on the bottom and top

Area of top & bottom triangles

2 (72 sq. cm) = 144 sq. cm

Finally...add the area of the 4 triangles to the area of the rectangular base

72 + 78 + 144 = 294 sq. cm

3 0
3 years ago
Can someone please help me with this because I don’t get it
yulyashka [42]

Answer:

161

Step-by-step explanation:

the sum of the two interior angles equals that exterior angle

121+40=161

8 0
3 years ago
Read 2 more answers
I need help ASAP whit this question
sweet [91]

Answer:

B. 7

Step-by-step explanation:

The original box must be 1 by 1 by 1.

So then the new box would be 2 by 2 by 2.

2×2×2=8

8-1=7

I hope this helps!

pls ❤ and mark brainliest pls!

7 0
3 years ago
9. The points (4, –6) and (9, -6) represent the location of two towns on a
k0ka [10]

Answer:

5 miles apart

Step-by-step explanation:

(4,-6) is 5 units away from (9,-6)

4 0
3 years ago
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