Answer:

Step-by-step explanation:

C, the probability of winning the match by saina

1-0.3

= 1-3/10

=10-3/10

=7/10

= 0.7

D, area of triangle=30cm^2

Height (h)=7+xcm

Base(b)= x

Area of triangl

1/2×b×h

I.e.

1/2×(7+x)×x =30

7x+x^2 -60=0

X^2+7x_60=0

x^2+12x-5x-60=0

x( x+12) -5 ( x+12) =0

(X+12)(x-5)=0

So x can be -12 or 5

Since measurements are never measured in negative numbers

X is 5cm

Answer:

Step-by-step explanation:

(a)......Let probability Jaya wins be P(A) and of Saina be P(B).

P(A)+P(B) = 1

0.3+P(B) = 1

P(B) = 1-0.3

P(B) = 0.7

(b).......Let, the base be x.

So, height would be x+7.

Area of triangle = 1/2*base*height

30 = 1/2*x*(x+7)

30*2 = x(x+7)

60 = x²+7x

x²+7x-60 = 0

x²+12x-5x-60 = 0

x(x+12)-5(x+12) = 0

(x+12) (x-5) = 0

x = -12 x = 5

Since, value cannot be negative, so x = 5

Length of base = x = 5cm