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use a system of equations to solve each problem.

1) at an “all you can eat” spaghetti dinner, the volunteers served 210 people and raised $935. adult meals cost $6 and child meals cost $3.50.
a) write an equation for the total amount of money raised from the adult and child dinners served.

b) write an equation for the total number of adult and children dinners served.

c) solve the system of equations to find the number of adult and number of child dinners served.

Awindow has the shape of a rectangle with a semi circle at the top. find the approximate area of the window using the dimensions shown. 4ft by 8ft

Answer asap! due in 30 minutes! ! 8th grade math

Consider the linear model for a two-stage nested design with b nested in a as given below. yijk=\small \mu + \small \taui + \small \betaj(i) + \small \varepsilon(ij)k , for i=1,; j= ; k=1, assumption: \small \varepsilon(ij)k ~ iid n (0, \small \sigma2) ; \small \taui ~ iid n(0, \small \sigmat2 ); \tiny \sum_{j=1}^{b} \small \betaj(i) =0; \small \varepsilon(ij)k and \small \taui are independent. using only the given information, derive the least square estimator of \small \betaj(i) using the appropriate constraints (sum to zero constraints) and derive e(msb(a) ).