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Rama09 [41]
1 year ago
7

4. Find the value of the expression below for r=4 and t=2.

Mathematics
2 answers:
cestrela7 [59]1 year ago
7 0

Answer:

(a) 9

Step-by-step explanation:

r = 4; t = 2

t³ - r + 20 ÷ r =

= 2³ - 4 + 20 ÷ 2

Order of operations says do the exponent first.

= 2 × 2 × 2 - 4 + 20 ÷ 4

Now do the multiplications and the division.

= 8 - 4 + 5

Do the subtraction.

= 4 + 5

Add.

= 9

Katen [24]1 year ago
5 0

Answer:

(a) 9

Step-by-step explanation:

\sf t^3 - r + 20 \div  r

substitute r = 4, t = 2

\sf (2)^3 - 4 + 20 \div 4

simplify

\sf (2)^3 - 4 + 5

cubic of 2 is 8

\sf 8 - 4 + 5

simplify

\sf 9

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Which expression has a value that is equivalent to 5n+13 when n= -5
maks197457 [2]

Answer:

Option A is correct.

4n + 8 expression which has a value that is equivalent to 5n+13 when n = -5

Step-by-step explanation:

Given the expression: 5n + 13

If n = -5

then, by substituting in given expression we get;

5(-5)+13 = -25+13 = -12

Option A:

4n + 8

Substitute the value of n = -5 we have;

4(-5) + 8 = -20 + 8 = -12

Option B:

2n + 2

then;

2(-5) + 2 = -10 + 2 = -8

Option C :

n^2+13

then;

(-5)^2+13 = 25 + 13 = 38

Option D:

n + 8

then;

-5 + 8 = 3

Therefore, only option A has expression which has a value that is equivalent to 5n+13 when n = -5


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