Concrete is often used to surface roads. Concrete is mostly a mixture of water, rocks or aggregate, and a powdery substance of calcined lime (also called cement). To create a strong, durable concrete, the proportion of the ingredients is important. A mixture that does not have enough cement paste will be difficult to distribute and will produce rough surfaces. A mixture with too much cement paste will result in a smooth surface, but resulting concrete can easily crack.

The table shows a concrete mixture used to pave 50 yards of street. Fill in the amount of each ingredient needed to pave 300 yards of street.

7

step-by-step explanation:

step-by-step explanation:

always plug in x. in this case, x equals 4.

i'm going to first solve 4(2+3x)

1) 4(2+3(4)) use pemdas to solve.

i'm going to multiply whats in the parenthesis first, so 3 times 4=12.

2)4 (2+12) i'm then going to multiply 4 by both numbers in the parenthesis (because multiplying comes before adding)

4 times 2= 8.   4 times 12= 48

4) (8+48)= 56 (answer)

i'm then going to solve 8+12x and plug in 4 for x.

1) 8 +12(4)

multiplying comes before adding, so i'm gonna multiply 12 and 4.

12 times 4= 48.

2) 8+48=56

both equal the same!

a box 3 3/4 feet long or 4+ feet.

step-by-step explanation: