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3 years ago

A door has an area of 21 square feet. It is 7 feet tall. How wide is the door?

Mathematics

1 answer:

Sati [7]3 years ago

8 0

Answer:

3 feet wide

Step-by-step explanation:

21/7= 3

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An object is thrown upward from the top of a 192 ft building with an initial velocity of 64 feet

Airida [17]

Answer:

t=6

Step-by-step explanation:

ground height = 0

(are you sure your formula is correct? isn't it - 16t²?)

if h=16t² +64t+192 is true then

16t² +64t+192 = 0

t² + 4t + 12 = 0

t = (-4 ± √(4² - 4*12)) / 2*1 = (-4 ± √-32) / 2 = -2 ± 2√-2

There is no solution of t

if it is h= - 16t² +64t+192

0 =- 16t² + 64t + 192

t² - 4t - 12 = 0

(t + 2) (t -6) = 0

t should be positive

t = 6 sec

7 0

3 years ago

Simplify these expressions a) 5x +3x + 2y + 4y b) 6x - 2x + 8y - 6y

cestrela7 [59]

Answer:

$a) \: 5x + 3x + 2y + 4y \\ = 8x + 6y$

$b) \: 6x - 2x + 8y - 6y \\ = 4x + 2y$

I hope I helped you^_^

3 0

3 years ago

at one scholl at prep level there were 5 set of twins,two sets of triplets and one set of quadruplets starting school this year.

katen-ka-za [31]

Answer: Fraction of twins = $\frac{5}{8}$ Fractions of triplets = $\frac{1}{4}$ Fractions of quadruplets = $\frac{1}{8}$

Step-by-step explanation:

Since we have given that

Number of set of twins = 5

Number of sets of triplets = 2

Number of sets of quadruplets = 1

Total number of sets is given by

$5+2+1=8$

Now, we need to find the fraction of those students.

So, Fraction of twins is given by

$\frac{5}{8}$

Fractions of triplets is given by

$\frac{2}{8}=\frac{1}{4}$

Fractions of quadruplets is given by

$\frac{1}{8}$

3 0

3 years ago

If a plane may be named by three noncollinear points on that plane, plane abc may also be named ____.

Bond [772]

Plane acb
plane bac
plane bca
plane cab
plane cba

8 0

3 years ago

NEED ANSWERS NOW!! (Reward) brainlest and pointsss

Misha Larkins [42]

Answer:

Step-by-step explanation:

(x+8)+(x+4)=0

×=-8 and ×= -4

4 0

2 years ago