Chapter 1 Math Reviewthe test will look very similar to these questions. Make sure you know how to do them or ask for help (your parents or teacher).
a.) Identity Property of Addition
c.) Identity Property of Multiplication
e.)Commutative Property of Addition
b.)Commutative Property of Multiplication
d.)Associative Property of Multiplication
f.)Associative Property of Addition
Write the letter next to each equation to show which property is being represented
1. 81 x 6 = 6 x 81
2. 18+ (5 + 7) = (18 + 5) + 7
3. 1 x 4= 4
4. 12 x (6 x 4) = (12 x 6 x 4
5. 0 + 18 = 18
6. 22 + 4 + 189 = 4 + 22 +189

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)

they used 313 gallons of paint

< xcy ≅ < xby

step-by-step explanation:

in δcax and δbax,

so, δcax ≅ δbax (side-angle-side or sas)

since δcax ≅ δbax, we can conclude < acx ≅ < abx

in δacy and δaby,

so, δacy ≅ δaby (side-angle-side or sas)

since δacy ≅ δaby, we can conclude < acy ≅ < aby

now,

< acy ≅ < aby

=> < acx + < xcy ≅ < abx + < xby

=> < acx + < xcy ≅ < acx + < xby   (since < acx ≅ < abx already proved above)

subtracting < acx from both sides, we get

< acx + < xcy -< acx ≅ < acx + < xby -< acx

cancelling out < acx and -< acx from both sides, we get

< xcy ≅ < xby (proved)