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Yuki888 [10]
2 years ago
14

Elisa is 9 years old. When 7 is subtracted from Krista’s age and 1/4 of the difference is taken , the result is equal to Elisa’s

age . How old is Krista?
Mathematics
1 answer:
garri49 [273]2 years ago
8 0

Answer:

43

Step-by-step explanation:

just go backwards so multiply 9 by 4

36

then add 7

43

then to check go 43-7

36-1/4

9

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Twelve flags are evenly spaced around a running track. Ryan started running at the first flag and took 30 seconds to reach the s
aniked [119]

Answer:

Ryan takes 6n+36m -42 seconds to reach the nth flag for the mth time.

Step-by-step explanation:

It takes Ryan to run from 1st to 6th flag in 30 seconds, so it takes him

30 * 6/3 = 36 seconds to make one complete round.

or it takes 6 seconds to run from one flat to the next.

To reach the nth flag (n=1,2,3,4,5, or 6)

Ryan takes 6(n-1) seconds.

To reach it the mth times, he needs to add 36(m-1) seconds.

So time it takes Ryan to reach the nth flag for the mth time takes

6(n-1) + 36(m-1)

= 6n - 6 + 36m - 36

= 6n+36m -42 seconds

3 0
1 year ago
Assume that a demand equation is giben by q = 7000-100p. Find the marginal revenue for the given production levels (levels of q)
nata0808 [166]

Answer:

Option B.

Step-by-step explanation:

The demand function is

q=7000-100p

where p is price.

Solve the demand equation for p.

100p=7000-q

p=\dfrac{7000-q}{100}

The revenue function is

R(q)=qp

Substitute the value of p in the above function.

R(q)=q(\dfrac{7000-q}{100})

R(q)=\dfrac{7000q-q^2}{100}

Differentiate with respect to q.

R'(q)=\dfrac{7000-2q}{100}

Equate R'(q)=0,

\dfrac{7000-2q}{100}=0

7000=2q

Divide both sides by 2.

3500=q

Therefore, the correct option is B.

4 0
1 year ago
Which set of angles can form a triangle
Aleksandr [31]

Answer:

  2 acute and 1 right

Step-by-step explanation:

The sum of angles of a triangle is always 180°.

Right angles are 90°, and obtuse angles are more than 90°. If each of the angles in the triangle is more than 0°, there obviously cannot be two angles that measure 90° or more. Just the sum of those two would be 180° or more, and that sum doesn't include the third angle.

So, any triangle can have at most one angle that is 90° or more (right or obtuse). The remaining two angles must be acute for the sum of angles to be 180°.

  2 acute and 1 right angle can form a triangle

7 0
2 years ago
You stand outside of a swimming pool at point C. Calculate the radius of the swimming pool.
Elenna [48]

Answer:

bruh whats the answer?

Step-by-step explanation:

8 0
1 year ago
A city that had 40,000 trees started losing them at a rate of 10 percent per year because of urbanization.
goblinko [34]

Answer:

t = 13.1576  years

Step-by-step explanation:

The situation can be modeled as

P = Po.(1-r)^t

Where

t is the years transcurred

Po is the initial amount

r is the rate of change

Po = 40000

r = 10% equivalent to 0.1

Now

A quarter of the original amount

(1/4)*Po = Po.(1-r)^t

(1/4) = (0.9)^t

t = 13.1576

Please, see attached picture

7 0
1 year ago
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