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Step-by-step explanation:

The whole triangle and the small triangle are similar. Therefore the sides are in proportion.

We have the equation:

x=7

Step-by-step explanation:

We can use similar triangles and proportions to solve.  Put the sides of the smaller triangle over the sides of the larger triangle.

5                   3

=

40 +5       3 + (2x+10)

Simplify

5                   3

=

45              (2x+13)

Cross multiply

5 *(2x+13) = 3*45

Divide by 5

5/5 *(2x+13) = 3*45/5

2x+13 = 3*9

2x+13 = 27

Subtract 13 from each side

2x+13-13 = 27-13

2x= 14

Divide by 2

2x/2 =14/2

x=7

step-by-step explanation: yes

let m = monomial

let t = trinomial

so, m times t = t.

monomial times a trinomial = another trinomial.