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3 years ago

Can someone help me pls

Mathematics

2 answers:

FrozenT [24]3 years ago

8 0

There are 4 lateral faces that are triangles. Each triangle is: A = $\frac{b x h}{2}$
A = $\frac{16 x 22}{2}$
   = 176

There is one base that is a square. A = L x W
A = 16 x 16
   = 256

Surface area = 256 + 4(176)
                     = 256 + 704
                     = 960

Answer: B

Ugo [173]3 years ago

4 0

Same help me you just broke my brain

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charles leaves the marina and sails his boat 10° west of north for 1.5h at 18km/h. he then makes a right turn to a heading of 60

Ymorist [56]

If Charles leaves the marina and sails his boat 10° west of north for 1.5h at 18km/h, then makes a right turn towards 60° east of north for 1.2h at 20km/h, he is 42 km from his starting point.

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3 years ago

What is equivalent to 4(6x+2)-5(2x-1)

givi [52]

Answer:

14x +13

Step-by-step explanation:

4(6x+2)-5(2x-1)

Distribute

24x +8 -10x +5

Combine like terms

24x -10x +8+5

14x +13

6 0

3 years ago

Read 2 more answers

Beth is flying a kite with 300 feet of string. The kite gets stuck in a tree, so she ties the other end of the string to a rock

Paraphin [41]

Answer:

$\displaystyle 172.1 ft$

Step-by-step explanation:

refer the attachment

let the string be hypotenuse and

the height be h And the angle be 35°

given that,

hypotenuse:300ft
angle:35°

since we are given the hypotenuse and want to figure out the opposite side we'll use sin function

so our equation would be

$\displaystyle \sin( {35}^{ \circ} ) = \frac{h}{300}$

cross multiplication:

$\displaystyle h= 300 \sin( {35}^{ \circ} )$

by using calculator we obtain:

$\displaystyle h = 172.1$

hence,

about 172.1ft far up the tree is the kite

7 0

3 years ago

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Andy was at Level –1 and took the elevator to Level 21. How many levels did the elevator move upward?

kramer

Answer: 22 Levels

Step-by-step explanation: He would need to go one level higher just to get to level one, and another 21 to get to the level that he wants to, so the total would be 22 levels.

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4 years ago

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Factor the expression completely. -x^4-4x^2+21

Shkiper50 [21]

Answer:

-(x^2-3)(x^2+7) Is the answer

Step-by-step explanation:

The first term is, x4 its coefficient is 1 .

The middle term is, +4x2 its coefficient is 4 .

The last term, "the constant", is -21

Step-1 : Multiply the coefficient of the first term by the constant 1 • -21 = -21

Step-2 : Find two factors of -21 whose sum equals the coefficient of the middle term, which is 4 .

-21 + 1 = -20

-7 + 3 = -4

-3 + 7 = 4 That's it

Step-3 : Rewrite the polynomial splitting the middle term using the two factors found in step 2 above, -3 and 7

x4 - 3x2 + 7x2 - 21

Step-4 : Add up the first 2 terms, pulling out like factors :

x2 • (x2-3)

Add up the last 2 terms, pulling out common factors :

7 • (x2-3)

Step-5 : Add up the four terms of step 4 :

-(x^2-3)(x^2+7)

Which is the desired factorization

(Hope this helps can I pls have brainlist (crown) ☺️)

5 0

3 years ago