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3 years ago

If 5 + b = 3 and a - b = 7 , then which of the following is true?

Mathematics

2 answers:

brilliants [131]3 years ago

4 0

2a plus 6 equl eight i hink so

ira [324]3 years ago

4 0

Answer:

Solve the given system first

5 + b = 3
a - b = 7

Find b:

b = 3 - 5 = -2

Find a:

a - (-2) = 7
a = 7 - 1
a = 5

Verify the options for correctness:

2a + b = 2(5) + (-2) = 10 - 2 = 8, correct
2a - 2b = 2(5) - 2(-2) = 10 + 4 = 14, incorrect
a - 2b = 5 - 2(-2) = 5 + 4 = 9, incorrect
2(a - b) = 2(5 - (-2)) = 2(7) = 14, incorrect

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dolphi86 [110]

Hello and Good Morning/Afternoon

Let's tale this problem step-by-step:

What does the problem want:

$\hookrightarrow \text{the unemployment compensation}$

Employment compensation =55% of the average of the last 26-week salary

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Answer: $400.65

Hope that helps!

#LearnwithBrainly

5 0

2 years ago

The population of a species of rabbit triples every year. This can be modeled by f(x) = 4(3)x and f(5) = 972. What does the 972

Alona [7]

972 represent the total population of the rabbits after five yours.
Answer: B

5 0

3 years ago

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A mars rover traveled from point a to point b at a speed of 4 cm/sec. Worsening conditions during the return trip caused the rov

miskamm [114]

Using a system of linear equations, the distance between points A and B is 6000 cm

Initial speed = 4cm/sec

Time taken = Distance / speed

Let ; distance = d

To time :

t = d / 4
4t = d ______(1)

Fro time :

(t + 15 × 60) = d / 2.5

2.5(t + 900) = d

2.5t + 2250 = d ______(2)

Equate (1) and (2)

4t = 2.5t + 2250

4t - 2.5t = 2250

1.5t = 2250

t = 1500 seconds

From (1) :

d = 4t

d = 4(1500)

d = 6000 cm

Therefore, the distance from point A to B is 6000 cm

Learn more : brainly.com/question/14000187

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3 years ago

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The function f(x) = 2x2 + 3x + 5, when evaluated, gives a value of 19. What is the function’s input value?

Brums [2.3K]

The function's input value is 2.

f(x) = 2x² + 3x + 5
f(x) = 2(2)² + 3(2) + 5
f(x) = 2(4) + 6 + 5
f(x) = 8 + 11
f(x) = 19

8 0

3 years ago

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The position, x, of an object is given by the equation x = A + Bt +Ct2, where t refers to time. What are the dimensions of A, B,

Serjik [45]

Answer: Dimensions of A are of length [L]

Dimensions of B are of $LT^{-1}$

Dimensions of C are of $LT^{-2}$

Step-by-step explanation:

The given equation is

$x(t)=A+Bt+Ct^{2}$

Since the dimension on the L.H.S of the equation is [L] , each of the terms on the right hand side should also have dimension of length[L] to be dimensionally valid

Thus

Dimensions of A = [L]

Dimensions of Bt = [L]

$Bt=[L]\\\\$ $[B][T]=[L]$ $\\\\\therefore [B]=LT^{-1}$

Similarly

Dimensions of $Ct^{}2 = [L]$

$Ct^{2}=[L]\\\\[C][T]^{2}=[L]\\\\\therefore [C]=LT^{-2}$

4 0

3 years ago