Name ___________________________________________________ Date ______________#38
Evaluating Formulas
Determine the value of the indicated variable.
1
5a-2b/4 = d
a=14
b=5
Find d
2
p = 2(l+5b)
p=82
b=4
Find l
3
m = 6a-9f
m=123
a=10
Find f
4
g-3s = 8d
s=24
g=8
Find d
5
x = ab/3
x=60
a=4
Find b
6
3t = p+r/8
p=6
r=0
Find t
7
3e = 5k/7
k=12
Find e
8
5a = 2b-9
a=6
Find b
9
2y = 3b+6z
y=17
z=10
Find b
10
f = (5a+4)6
f=17
Find a
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Expressions
When n = 6, t = 4 and w = 3, work out these...
A. 2n
B. 3(n + 1)
C. t + 7
D. t + 2
E. 4w - 7
F. w(t - 2)
3
When n = 2, t = 7 and w = 3, which of these is the largest?
G. 7n
5w
t+5
H. 3n + 10
2t
6w - 1
I. 2(w + 2)
3(t - 4)
nw
Evaluate each of these expressions when f = 5, h = 4 and r = 10
J. f2
K. h2
L. r2 - 10
M. 10 + f2
N. h2 - 6
O. r2 - fh
P.
Write an expression for the area of this square.
x
Q.
Write an expression for the area of this triangle.
2x
R.
x+2
Using your expressions, work out the area of the square and triangle if x = 3.