exam Maths Puzzle Numerical Ability

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Which product would be used to solve the matrix equation below by using inverse matrices?

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exam Other Question

In each of the following settings, give a 95% confidence interval for the coefficients of x1 and x2.
(a) n = 22, y hat = 11.1 + 105x1 + 15.1x2, SEb1 = 7.4 and SEb2 = 4.9.
95% CI which conic is this
7x^2-12y^2-14x+24y-28=0?