Evaluate 2n -1, where n=7
Options 1,64,127

127

Step-by-step explanation:

n = 7

127

Step-by-step explanation:

We are given the expression:

(2^n)-1

We also know that n=7. Therefore, we can substitute 7 in for n.

(2^7)-1

Evaluate the exponent first. 2^7 is equal to multiplying 2, 7 times.

2^7=2*2*2*2*2*2*2=128

2^7=128

128-1

Subtract 1 from 128

127

infinitely many solutions

step-by-step explanation:

we have been given the equation;

2(2x + 3) = -4 + 2(2x + 5)

we need to determine the value of x.

2(2x + 3), we expand this expression to obtain 4x + 6

similarly 2(2x + 5) will become 4x + 10

now we have;

4x + 6 = -4 + 4x + 10

4x + 6 = 4x + 10 - 4

4x + 6 = 4x + 6

the expression on the left hand side is identical to the one on the right hand side. therefore, we are looking at just a single straight line whose equation is;

y = 4x + 6

consequently, we shall have infinitely many solutions