Q.1 x-2/5=7
divide -2/5 which is -0.40
x-0.40=7. Move -0.40 to the right side of the equal sign and that becomes +0.40
x=7+0.40 . 7+0.40 is 7.4
x=7.4
Q.2 2.1r=6.174
divide 2.1 by both sides which 2.1r divided by 2.1 is 1r and 6.174 divided by 2.1 is 2.94
r=2.94
Q.3
equation: 2/3 = 32 2/3 d
Q.4 x9=3/5
3/5 is 0.60
x9=0.60
divide 9 by both sides. 9x divided by 9 is 1x and 0.60/9 is
0.0
6666 (the 6 is continuing)
x=0.06666
Q.5
x=-3
Q.6
7.25 =0.5x
divide 0.5 by both sides. 0.5x divided by 0.5 is 1x and 7.25 divided by
0.5 is 14.5
x=14.5
Q.7
the expression: 7-9m
Q.8
answer is C
Q.9
(x2) + (10(2))
Q^12
The rule is that (a^b)^c = a^b(c)
Q^6(2) = Q^12
Answer: to solve the 3 unknown variables X, Y and Z in a set of 3 equations. Each equation has containing the unknown variables X, Y and Z. This 3 equations 3 unknown variables solver computes the output value of the variables X and Y with respect to the input values of X, Y and Z coefficients. In mathematic calculations, there are many situation arises where the usage of equation containing 3 unknown variables need to be solved prior to go further with the calculations. Therefore when it comes to online calculation, this Find the value of X, Y and Z calculator is an essential tool to assist you to find out the variable values given in the equation.
Step-by-step explanation: X = 2
Y = -1
Z = 1
Answer:
The outering is 11 cm so let's see what the Area is. We use the formula Area of a circle:
A = πr² = πd2/4
If:
Radius, r = 11 cm
Then:
Diameter, d = 22 cm
Circumference, C = 69.115038378975 cm
Area, A = 380.13271108436 cm²
now all we need to do is subtracts the inner circle Area.
If:
Radius, r = 9 cm
Then:
Diameter, d = 18 cm
Circumference, C = 56.548667764616 cm
Area, A = 254.46900494077 cm²
Thus: 380.13271108436 cm² - 254.46900494077 cm² =
125.6637061436 cm²
Step-by-step explanation: