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trapecia [35]
3 years ago
14

In a multiple choice examination of 20 questions, four marks are given for each correct answers and one mark is deducted for eac

h wrong answer. There is no penalty for not attempting a question. a candidate attempts "a" questions and get "c" correct. Write down, and simplify, an expression for the candidate's total mark in terms of "a" and "c".​
Mathematics
1 answer:
finlep [7]3 years ago
8 0

Answer:

Total Mark = 5c - a

Step-by-step explanation:

Total Mark = 4c - (a - c) = 5c - a

Marks for correct questions = 4c

Marks deducted for incorrect questions = a - c

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Solve –16t² +144= 0 to find the number of seconds, t, it takes for an object dropped from 144 ft above the ground to hit the gro
Vlad1618 [11]

Answer:

h(t) = -16t2 + 144

h(1) = -16(12) + 144 = 128 ft

h(2) = -16(22) + 144 = 80 ft

h(2) - h(1) = 80 - 128 = -48 ft

It fell 48 ft between t = 1 and t = 2 seconds.

It reaches the ground when h(t) = 0

0 = -16t2 + 144

t = √(144/16) s = 3s

It reaches the ground 3s after being dropped.

Step-by-step explanation:

6 0
2 years ago
What fraction is equivalent to 3/9​
cluponka [151]

Answer:

There are infinity equivalent fractions to 3/9

Step-by-step explanation:

1 /3, 2 /6, 3/ 9, 4 /12, 5/ 15, 6 /18, 7/ 21, 8/ 24, 9 /27, 10/ 30, 11/ 33, 12/ 36, 13/ 39, 14 /42, 15 /45..........

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2 years ago
⦁ Evaluate ⦁ 6! ⦁ 8P5 ⦁ 12C4
lisabon 2012 [21]
6! = 6 * 5 *4*3*2*1 =720

8p5 = 8*7*6*5*4 = 6720

12C4 = (12p4)/4! = (12*11*10*9)/4*3*2*1 = 495
7 0
3 years ago
Read 2 more answers
Solve for .6u+7u-16=-81<br> Simplify your answer as much as possible.
Vesnalui [34]

Answer:

6u+7u-16=-81

We simplify the equation to the form, which is simple to understand

6u+7u-16=-81

We move all terms containing u to the left and all other terms to the right.

+6u+7u=-81+16

We simplify left and right side of the equation.

+13u=-65

We divide both sides of the equation by 13 to get u.

u=-5

Step-by-step explanation:

I think i did it correct

7 0
3 years ago
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stich3 [128]

Answer:

Step-by-step explanation:

Y=y

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3 years ago
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