SOMEONE HELP ASAP PLEASE I NEED HELP

Question #1:     t = unknown number

15 + 6t = 81

[The sum(addition) of 15 and 6 times(multiplication) a number t is(=) 81.

So 15 plus 6t(6 times t) equals 81.]      

To find t, isolate/get the variable "t" by itself in the equation:

15 + 6t = 81     Subtract 15 on both sides

15 - 15 + 6t = 81 - 15

6t = 66    Divide 6 on both sides to get "t" by itself

t = 11      The number(t) is 11

Question #2:          h = the number of hours

55h + 40 = 190

[The electrician charges $40 plus $55 per hour(h) that she works, and the total charge is(=) $190]

To find h, isolate/get the variable "h" by itself in the equation:

55h + 40 = 190      Subtract 40 on both sides

55h = 150     Divide 55 on both sides to get "h" by itself

h =   Simplify the fraction

    The electrician works 30/11 hours (or 2.7272727272....repeating forever)

Question #3:     m = the number of miles traveled

0.75m + 1.75 = 4.75

[The taxi charges $40 plus $0.75 per mile(m), and the total charge is(=) $4.75]

To find m, isolate the variable:

0.75m + 1.75 = 4.75     Subtract 1.75 on both sides

0.75m = 3       Divide 0.75 on both sides to get "m" by itself

m = 4     The trip is 4 miles.

last option

step-by-step explanation:

given that δdef is right and isoceles,

assuming that side df is the hypotenuse means that de an ef are the other 2 sides that intersect at 90° and are of equal length.

because they are of equal length, we can say that they are congruent

because they intersect at 90°, their slopes must be opposite reciprocals.

only the last option satisfies these conditions.

answer: b.

step-by-step explanation:

the y coordinate for point b is 0, and answer b is the only one with that y coordinate.