Question

Pls pls solve these questions

Answer 1

Answer:

1).p=2.5 and q=4.

2).S=-420

Step-by-step explanation:

1).

4p+5q=30----(1)

6p+q=19-------(2)

eq(1) x 3 and eq(2) x 2,

we get, 12p+15q=90-----(3)

12p+2q=38----(4)

eq(3)-eq(4),

13q= 52

q=52/13= 4

p= 10/4 =2.5.

2). d=-3, l=-50.

l=a+(n-1)(d)

-50=a+20(-3)

a=10.

S=n/2(a+l)

S= -420