Solve: 7-4(x-1) = 20 step 1: 7-4x + 1 = 20 step 2: 8-4x = 20. step 3: (-1/4) -4x = 12 (-1/4)step 4: x=-3 which is the first incorrect step in the solution shown above a. step 3 b. step 4 c. step 1 d. step 2

C

Step-by-step explanation:

given 7 - 4(x - 1) = 20 ( Step 1 is to distribute the parenthesis )

7 - 4x + 4 = 20  ( not 7 - 4x + 1 = 20 ← - 1 is multiplied by - 4 )

Step 1 ← is incorrect → C

answer

a,b, and d

explanation

a reflection angle is more than

but less than;

an angle that measures

is a reflex angle.(true)

an angle that measures less than

is acute.(true)

provided we are considering angles greater or equal to zero.

an acute angle lies in the range.

an obtuse angle is less than 180° but more than 90°

an angle that measures 300° is obtuse (false)

an angle that measures 65° is an acute angle.(true)

the correct option is:

b. a value of the variable that makes the polynomial equal to zero.

the root or roots of a polynomial are the values of the variable that makes the polynomial equal to 0. we can find the roots of a polynomial making the expression equal to 0 and then, isolating the variable (it it has just one variable).

for example, given the following polynomial:

the root or zero of the polynomial, can be found by making the expression equal to 0, and then, isolating the variable, so, finding the root we have:

therefore, we have that the root of the polynomial is equal to 2.

we must remember that the number of roots that a polynomial can have, will depend on the degree of the polynomial, a first degree polynomial have will have one single root, a second degree polynomial (quadratic expression) may have two roots and so.

hence the correct option is:

b. a value of the variable that makes the polynomial equal to zero.

have a nice day!