Help 7th grade math plss

21cm^2

Step-by-step explanation:

1/2 5 x 6 = 15

1/2 x 4 x 3 = 6

15+6 = 21cm^2

If you was working out a missing angle you would 1/2 the longest lines and add them up then add the shortest line

ie) 1/2 6 = 3

1/2 3 5 = 2.5

36+ 25 = 61 sq rt

= 7.81

Then find your multiplier 6/5 =  1.2 you take this multiply by 10

12 and half it = 6 x 7.810 = 46.86 = your angle for the larger triangle.

The smaller triangle missing angle is same method but you keep the multiplier without multiplying by 10 or halfling it, you need to half the 2 sides first then add them to the smaller side found doing Pythagoras and find you r multiplier large side/ second largest side = x  then times x by the multiplier two sides halved and smaller side added. = 3 sq 4 sw = 9+16 = 25 sq = 5 large then + half 4 = 2 + 3

= 2.5+ 2 + 3 = 7.5

then 5/4 = 1.25

=1.25 x 10 = 12.5 then half it = 6.5 then multiply it by 7.5

=6.5 x 7.5 = 48.75 missing angle smaller triangle.

ou would have 12 of each

the solution of the equation is 2.23 ⇒ answer b

step-by-step explanation:

* lets revise the meaning of exponential function

- the form of the exponential function is y = ab^x, where a ≠ 0, b > 0 ,  

  b ≠ 1, and x is any real number

- it has a constant base b

- it has a variable exponent x

- to solve an exponential equation, take the log or ln of both sides,  

  and solve for the variable

* lets solve the problem

∵

- the base is 7 and the exponent is x

- insert ㏑ in both sides

∴

- use the rule

∴ x ㏑(7) = ㏑(77)

- to find x divide both sides by ㏑(7)

∴

* the solution of the equation is 2.23 to the nearest 2 decimal places