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3 years ago

Answer the question plz and be the brainliest

Mathematics

1 answer:

snow_tiger [21]3 years ago

4 0

Step-by-step explanation:

Maryam scores in paper 1 65% × 120

= 65/100 × 120

= 78 marks of full scores 120 marks

scores in paper 2 80% × 80

= 80/100 × 80

= 64 marks of full scores 80 marks

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A model rocket is launched with an initial upward velocity of 126 ft/s. The rocket's height h (in feet) after 1 seconds is given

Vlad [161]

Step-by-step explanation:

f(t) = -16t² + 126t

for what values of t did this function deliver 50 ft of height ?

50 = -16t² + 126t

-16t² + 126t - 50 = 0

the general solution to such a squared equation is

x = (-b ± sqrt(b² - 4ac))/(2a)

in our case

x = t

a = -16

b = 126

c = -50

t = (-126 ± sqrt(126² - 4×-16×-50))/(2×-16) =

= (-126 ± sqrt(15876 - 3200))/-32 =

= (-126 ± sqrt(12676))/-32 =

= (-126 ± 112.5877436...)/-32

t1 = (-126 + 112.5877436...)/-32 = -13.41225644.../-32 =

= 0.419133014... ≈ 0.42 seconds

t2 = (-126 - 112.5877436...)/-32 = -238.5877436.../-32 =

= 7.455866986... ≈ 7.46 seconds

so, this means, right after launch the ticket reaches 50ft (from below) after 0.42 seconds, and then, when it falls back down, it will reach 50ft again (this time from above) after 7.46 seconds of flight time.

3 0

2 years ago

Which translation will change figure ABCD to figure A′B′C′D′? (5 points)

mylen [45]

6 units to the left and 7 units down will get you A'B'C'D

6 0

3 years ago

WHAT IS THE AREA OF TRIANGLES?

Nostrana [21]

In order to find the area of a triangle you have to multiply the base with the height then divide by 2.

hope this helps

4 0

3 years ago

Read 2 more answers

(4.70x10^3)+(8.6x10^5)

Natali [406]

Answer:

8.647 x 10^5

Step-by-step explanation:

3 0

3 years ago

We roll a fair die repeatedly until we see the number four appear and then we stop. The outcome of the experiment is the number

muminat

Answer:

Step-by-step explanation:

given that we roll a fair die repeatedly until we see the number four appear and then we stop.

the number 4 can appear either in I throw, or II throw or .... indefinitely

So X = the no of throws can be from 1 to infinity

This is a discrete distribution countable.

Sample space= {1,2,.....}

b) Prob ( 4 never appears) = Prob (any other number appears in all throws)

= $\frac{5}{6} *\frac{5}{6} *\frac{5}{6} *\frac{5}{6} *...\\=(\frac{5}{6} )^n$

where n is the number of throws

As n tends to infinity, this becomes 0 because 5/6 is less than 1.

Hence this probability is approximately 0

Or definitely 4 will appear atleast once.

8 0

3 years ago