I need to solve systems of equations by substitution these are the two equations

7x+

Y=-26

12x+11y=39

Find all the powers of 4 in the range 4 through 1,000 what do i do for this?

A polling company finds that 60% of Democrats give a 'favorable' rating for a senator and 52% of Republicans give a 'favorable' rating for the same senator.

The expression 1/2bh gives the area of a triangle where b is the base of the triangle and h is the height of the triangle. What is the area of a triangle with the base of 7cm and a height of 4 cm?

Solve the equation - 3+½n=½ (-n+14)

If the tip varies directly with the number of guests, which equation represents the relationship between the tip, t, and the number of guests, g? t = 1.8g t = g/18 g = 1.8t g = t/18

1+1-2+5-3+6-6+2x2=10 is this right or wrong

Jason wrote the mixed number 1 1/3 as the sum of three fractions. None of the fractions had a denominator of 3. How is this possible? What fractions might jason have used?

Aaron needs to hire a waiter. Waiter A is offering his services for an initial $25 in addition to $4.75 per hour. Waitress B is offering her services for an initial $30 in addition to $3.75 per hour.

A latter is placed 30 inches from the wall. It touches the wall at a height of 50 inches from the ground. The angle made by the ladder with the ground is degrees, and the length of the ladder is inches.

Which is the most accurate measurement of 1 mile?