Step-by-step explanation:

in 2nd exp. this is because by using the formula of a2-b2
Answer:
P = 17t + 7
Step-by-step explanation:
P = 2L + 2w
L = 1.5t + 5
w = 7t - 1.5
P = 2*(1.5t + 5) + 2*(7t - 1.5)
P = 3t + 10 + 14t - 3
P = 17t + 7
Answer:
10x + 16
Step-by-step explanation:
Doing the distributive property, we get the answer 10x + 16.
Answer: 28
Step-by-step explanation:
The 7th term of an AP is 4 and its common difference is -4. The 7th term of an arithmetic progression is written as:
a + 6d = 4
where,
a = first term
d = common difference= -4
a + 6d = 4
a + 6(-4) = 4
a - 24 = 4
a = 4 + 24
a = 28
The first term is 28.