1. The three angles of a triangle are (x − 25)°, (2x+ 40)°and 30°.
a. Form an equation to represent the information given, given that the sum of the angles in a triangle is 180°. [1]
b. Using your equation, calculate the value of x. [1]
c. Give the value of the two unknown angles in the triangle. [2]
2. The sum of two numbers is 19. Their difference is 9.
a. Form a pair of simultaneous equations to represent the information given. [1] b. Solve your simultaneous equations and give the value of the numbers. [2] 3. Mrs. Moxey bought $155 worth of groceries. She paid with 13 notes, using $5 notes and $20 notes.
a. Form a pair of simultaneous equations to represent the information show. [1] b. Solve your simulations equations to determine how many of each type of note was used. [2]
1(a) really? they told what to add up ...
x-25 + 2x+40 + 30 = 180
now you try on the others. Just think about what they are saying, and what they are asking.