Answer:
The letter "x" is often used in algebra to mean a value that is not yet known. It is called a "variable" or sometimes an "unknown".
Step-by-step explanation:
In x + 2 = 7, x is a variable, but we can work out its value if we try:)
Answer:
35
Step-by-step explanation:
You take 3 times 7 and that's 21. Then 2 times 7 and that's 14. So, 21+14=35
Answer:
45.625cm²
Step-by-step explanation:
To solve this, we need to do the area of the circle - the area of the rectangle:
<u>Area of the circle</u>
a = πr² (r is the radius, half the diameter)
a = π × 4²
a = π × 16
a = 16π or 50.265cm²
<u>Area of the rectangle</u>
a = length × width
a = 5 × 1
a = 5cm²
50.265 - 5 = 45.265
Hope this helps!
R = 112/1000 x 4 = 0.028 x 100 (find percentage) = 2.8%